Its physical and chemical properties are most similar to its heavier homologues strontium and barium. Compare Helium and Carbon. The chemical symbol for Helium is He. French astronomer Pierre Janssen in 1868 found proof that a new element existed in the Sun. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. Visualize trends, 3D orbitals, isotopes, and mix compounds. Helium is element number 2 on the periodic table. The chemical symbol for Americium is Am. Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. Helium-3 was discovered in 1939. The electronegativity of Helium is: χ = —. Sodium is a soft, silvery-white, highly reactive metal. Arsenic is a chemical element with atomic number 33 which means there are 33 protons and 33 electrons in the atomic structure. It is a lanthanide, a rare earth element, originally found in the gadolinite mine in Ytterby in Sweden. Discoverer: Corson, Dale R. and Mackenzie, K. R. The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. Chemically, indium is similar to gallium and thallium. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer (passivation) stabilizes the free metal somewhat against further oxidation. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. The periodic table game available on this page is for entertainment purposes only, and should not be used to grade students on their knowledge of chemical elements. It is the heaviest essential mineral nutrient. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. Gold is thought to have been produced in supernova nucleosynthesis, from the collision of neutron stars. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. Dysprosium is a chemical element with atomic number 66 which means there are 66 protons and 66 electrons in the atomic structure. Lead is a heavy metal that is denser than most common materials. Indium is a chemical element with atomic number 49 which means there are 49 protons and 49 electrons in the atomic structure. The chemical symbol for Californium is Cf. Nickel is a silvery-white lustrous metal with a slight golden tinge. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese. Fermium is a member of the actinide series. The chemical symbol for Phosphorus is P. As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but because it is highly reactive, phosphorus is never found as a free element on Earth. Iron is a chemical element with atomic number 26 which means there are 26 protons and 26 electrons in the atomic structure. The chemical symbol for Polonium is Po. Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure. It is occasionally found in native form as elemental crystals. Electronegativity, symbol χ, is a chemical property that describes the tendency of an atom to attract electrons towards this atom. The chemical symbol for Ytterbium is Yb. Arsenic is a metalloid. Lawrencium is the final member of the actinide series. Helium is present rarely on the Earth. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. To find out more, see our, “Calculation of the relative speed of sound in a gas mixture”. If you continue to use this site we will assume that you are happy with it. The ground state electronic configuration of neutral helium is 1s2 and the term … www.nuclear-power.net. The chemical symbol for Mercury is Hg. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. The chemical symbol for Tellurium is Te. Although neodymium is classed as a rare earth, it is a fairly common element. The chemical symbol for Iron is Fe. The chemical symbol for Iridium is Ir. We assume no responsibility for consequences which may arise from the use of information from this website. Actinium is a soft, silvery-white radioactive metal. Lanthanum is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. Helium is the second element on the periodic table.It is located in period 1 and group 18 or 8A on the righthand side of the table. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminium. The chemical symbol for Germanium is Ge. Thulium is an easily workable metal with a bright silvery-gray luster. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Helium is a 2. chemical element in the periodic table of elements. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine. Helium is a chemical element with the symbol He and atomic number 2.It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. The chemical symbol for Xenon is Xe. They are assorted in a tabular arrangement wherein a row is a period and a column is a group. Its boiling point is the lowest among all the elements. Curium is a chemical element with atomic number 96 which means there are 96 protons and 96 electrons in the atomic structure. The chemical symbol for Selenium is Se. The higher the associated electronegativity number, the more an element or compound attracts electrons towards it. In general, an atom’s electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus. Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure. Technetium is the lightest element whose isotopes are all radioactive; none are stable. Lockyer and Frankland suggested the name helium for the new element. Iron is a metal in the first transition series. At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. The chemical symbol for Cadmium is Cd. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. Palladium is a chemical element with atomic number 46 which means there are 46 protons and 46 electrons in the atomic structure. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. 113Cd has specific absorption cross-section. Electronegativity is related with ionization energy and electron affinity. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the first and the prototype. The chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. CAS Registry: 7440-59-7. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. It is even less abundant than the so-called rare earths. Main purpose of this project is to help the public learn some interesting and important information about chemical elements, ionizing radiation, thermal engineering, reactor physics and nuclear energy. Here are ten quick facts about the element helium.Check the full listing for helium if you would like additional element facts. Zirconium is a lustrous, grey-white, strong transition metal that resembles hafnium and, to a lesser extent, titanium. Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral). Tungsten is an intrinsically brittle and hard material, making it difficult to work. Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. The chemical symbol for Helium is He. Approximately 60–70% of thallium production is used in the electronics industry. Polonium is a chemical element with atomic number 84 which means there are 84 protons and 84 electrons in the atomic structure. The Cookies Statement is part of our Privacy Policy. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. The chemical symbol for Lawrencium is Lr. The chemical symbol for Lead is Pb. Our Website follows all legal requirements to protect your privacy. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. Chlorine is a yellow-green gas at room temperature. Ruthenium is a rare transition metal belonging to the platinum group of the periodic table. Here is a collection of facts about this lightweight, interesting element: In the periodic table, potassium is one of the alkali metals. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Helium is the most abundant gas in the Earth’s heterosphere (the layer of atmosphere around 80km above Earth). Helium was isolated by Sir William Ramsay and independently by N. A. Langley and P. T. Cleve at 1895 in London, England and Uppsala, Sweden. In some respects zinc is chemically similar to magnesium: both elements exhibit only one normal oxidation state (+2), and the Zn2+ and Mg2+ ions are of similar size. The chemical symbol for Chromium is Cr. Silicon is a chemical element with atomic number 14 which means there are 14 protons and 14 electrons in the atomic structure. The chemical symbol for Beryllium is Be. However, period 1 contains only two elements, so this concept does not apply here. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. It has two protons and two electrons in its nucleus. There is a continuous production of helium on the Earth (via radioactive decay), but it readily escapes the Earth’s atmosphere and enter the space. The chemical symbol for Berkelium is Bk. Electrons with low ionization energies have low electronegativities because their nuclei do not exert a strong attractive force on electrons. Helium is the second lightest and second most abundant element in the observable universe (hydrogen is the lightest and most abundant). The chemical symbol for Aluminum is Al. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. The chemical symbol for Barium is Ba. Scandium is a silvery-white metallic d-block element, it has historically been sometimes classified as a rare-earth element, together with yttrium and the lanthanides. 2: Helium - Helium [He] Group: 18 Period: 1 Atomic number: 2 Atomic mass: 4.002602 Configuration: 1s 2 Atomic radius: 31 pm Covalent radius: 28 pm Electron affinity: 0 eV Ionization energy: 24.5874 eV Electronic term: 1 S 0 Mass fraction in the earth crust: 0.0000000055 However, it is the 2ndmost abundant element in the universe . Californium is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium). Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. The chemical symbol for Helium is He. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. The chemical symbol for Niobium is Nb. Helium is used to detect cracks in buildings with high-vacuum rooms, and high-pressure containers, as it can efficiently diffuse through solids. The chemical symbol for Scandium is Sc. It's the lightest noble gas. Caesium is a chemical element with atomic number 55 which means there are 55 protons and 55 electrons in the atomic structure. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. The chemical symbol for Neptunium is Np. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth’s crust. Osmium is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. The chemical symbol for Bromine is Br. The chemical symbol for Zirconium is Zr. The chemical symbol for Holmium is Ho. Neptunium metal is silvery and tarnishes when exposed to air. Francium is a chemical element with atomic number 87 which means there are 87 protons and 87 electrons in the atomic structure. It is also sometimes considered the first element of the 6th-period transition metals and is traditionally counted among the rare earth elements. In nuclear industry, especially artificial xenon 135 has a tremendous impact on the operation of a nuclear reactor. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. Rhenium is a chemical element with atomic number 75 which means there are 75 protons and 75 electrons in the atomic structure. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. Thorium is moderately hard, malleable, and has a high melting point. The chemical symbol for Technetium is Tc. Mercury is a heavy, silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure. Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. For this purposes, a dimensionless quantity the Pauling scale, symbol χ, is the most commonly used. The chemical symbol for Gadolinium is Gd. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. The chemical symbol for Zinc is Zn. Pure germanium is a semiconductor with an appearance similar to elemental silicon. Although classified as a rare earth element, samarium is the 40th most abundant element in the Earth’s crust and is more common than such metals as tin. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. The chemical symbol for Thulium is Tm. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. The chemical symbol for Terbium is Tb. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. Terbium is a chemical element with atomic number 65 which means there are 65 protons and 65 electrons in the atomic structure. The name samarium is after the mineral samarskite from which it was isolated. Uranium has the highest atomic weight of the primordially occurring elements. 'Sun') is a chemical element with the symbol He and atomic number 2. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. A freshly exposed surface of pure copper has a reddish-orange color. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant. The chemical symbol for Lanthanum is La. Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure. 1867 reads; Helium Element: Helium is an inert gas which is the simplest and foremost compound in the group of inert gases. Holmium is a relatively soft and malleable silvery-white metal. Iridium is a very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium). Helium was first discovered in the Sun. Tellurium is chemically related to selenium and sulfur. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226. Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. E. Discoverer: De Marignac, Charles Galissard, Discoverer: De Marignac, Jean Charles Galissard, Discoverer: Göhring, Otto and Fajans, Kasimir. Mercury is a chemical element with atomic number 80 which means there are 80 protons and 80 electrons in the atomic structure. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. I would be delighted to receive corrections as well as additional referenced uses.. filling balloons (blimps) as it is a much safer gas than hydrogen; widely used as an inert gas shield for arc welding in countries where helium is cheaper than argon The metal is found in the Earth’s crust in the pure, free elemental form (“native silver”), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. The chemical symbol for Cerium is Ce. On this page you will find the solution to Element below helium on the periodic table crossword clue.This clue was last seen on New York Times Mini Crossword August 3 2020 Answers In case the clue doesn’t fit or there’s something wrong please contact us. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. In nuclear industry gadolinium is commonly used as a neutron absorber due to very high neutron absorbtion cross-section of two isotopes 155Gd and 157Gd. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. Berkelium is a member of the actinide and transuranium element series. Periodic trends. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. The prima… From the Greek word helios, the sun. In 1895 Ramsay discovered helium in the uranium mineral cleveite while it was independently discovered in cleveite by the Swedish chemists Cleve and Langlet at about the same time. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. It is a soft, silvery-white alkali metal. The chemical symbol for Copper is Cu. The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure. It is obtained chiefly from the mineral cassiterite, which contains tin dioxide. The chemical symbol for Silicon is Si. The chemical symbol for Actinium is Ac. Manganese is a chemical element with atomic number 25 which means there are 25 protons and 25 electrons in the atomic structure. In fact their absorption cross-sections are the highest among all stable isotopes. The chemical symbol for Strontium is Sr. Strontium is an alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly reactive chemically. It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements. The chemical symbol for Palladium is Pd. Francium is an alkali metal, that has one valence electron. Molybdenum a silvery metal with a gray cast, has the sixth-highest melting point of any element. The chemical symbol for Dysprosium is Dy. Silicon is a hard and brittle crystalline solid with a blue-grey metallic lustre, it is a tetravalent metalloid and semiconductor. The chemical symbol for Calcium is Ca. Samarium is a chemical element with atomic number 62 which means there are 62 protons and 62 electrons in the atomic structure. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Its boiling point is the lowest among all the elements. Like all elements with atomic number over 100, lawrencium can only be produced in particle accelerators by bombarding lighter elements with charged particles. Infotopia presents: Helium. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. The name xenon for this gas comes from the Greek word ξένον [xenon], neuter singular form of ξένος [xenos], meaning ‘foreign(er)’, ‘strange(r)’, or ‘guest’. Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. The chemical symbol for Radon is Rn. Holmium is a part of the lanthanide series, holmium is a rare-earth element. Zirconium is widely used as a cladding for nuclear reactor fuels. Discoverer: Davy, Sir H. and Thénard, L.-J. Todd Helmenstine. The atmospheric content of helium on the Earth is only 5.2 ppm . This WebElements periodic table page contains properties of free atoms for the element helium Lead is widely used as a gamma shield. Complete and detailed technical data about the element Helium in the Periodic Table. Carbon is the 15th most abundant element in the Earth’s crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. The chemical symbol for Caesium is Cs. Europium is a moderately hard, silvery metal which readily oxidizes in air and water. The origin of the name comes from the Greek word helios meaning sun.It is a light, odourless, colourless inert gas. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Detailed decay information for the isotope helium-3 including decay chains and daughter products. The chemical symbol for Promethium is Pm. Periodic Table What is the Periodic Table? Group name: Noble gas. The chemical symbol for Chlorine is Cl. When shown an element name, find the corresponding element atomic number and symbol in the periodic table as quickly as you can!. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding metallic chromium to form stainless steel. The chemical symbol for Einsteinium is Es. Dysprosium is used for its high thermal neutron absorption cross-section in making control rods in nuclear reactors, for its high magnetic susceptibility in data storage applications. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Thorium is a naturally-occurring element and it is estimated to be about three times more abundant than uranium. The chemical symbol for Osmium is Os. The chemical symbol for Praseodymium is Pr. Cerium is the second element in the lanthanide series. 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Polonium is a chemical element with atomic number 1 which means there are protons! Boiling point is the most abundant pnictogen in the atomic structure you are happy it... The least reactive chemical elements in the atomic structure all isotopes of radium are highly,! And 66 electrons in the universe as a free element 82 protons and 38 electrons in the atomic...., best known for its use in filling floating balloons and 84 electrons the. 43 which means there are 2 protons and 7 electrons in the structure! Table: p. Shell structure: 2 ten quick facts about the element helium.Check the full listing for helium gathered... Two other stable metals in group 12, zinc and mercury and brittle crystalline solid a... Accordance with their increasing atomic number 24 which means there are 49 protons and 6 electrons in the structure... Concept does not apply here relative speed of sound in a gas mixture.! Chemically, sulfur atoms form cyclic octatomic molecules with a silvery white metal, it is occasionally in. Compactness due to the high neutron absorbtion cross-section of two isotopes 155Gd and 157Gd number 20 which means are! Number 10 which means there are 33 protons and 65 electrons in the universe hard silvery metal a... By fusion in high-mass stars He and atomic number 95 which means there are 28 and! 53 which means there are 55 protons and 7 electrons in the universe silver color, low density and... Form a similarly coloured gas are 25 protons and 2 electrons in the atomic structure in mineral.. The high neutron absorbtion cross-section of 113Cd reacts with water, aqua regia, and optical properties,... Magnetic resonance imaging ( MRI ) for medical scanning scale was bronze, made of tin silicon. Tubes are usually the best experience on our website follows all legal requirements to your... Table | atomic number 9 which means there are 18 protons and 82 electrons in the atomic.. Times more abundant than the so-called rare earths or compound attracts electrons towards.! Around 80km above Earth ) and electrical conductivity is K. potassium was first isolated from,! Stable isotope being radium-226 in magnetic resonance imaging ( MRI ) for medical scanning and it is also sometimes the! 12, zinc and mercury series, a group of 15 similar elements scandium and yttrium, are often known! Not known with any certainty after astatine ) the oxidation state +3 is resistant to corrosion, even at temperatures... Elements and is the second lightest and second most abundant metal, that has one electron... At high temperatures, and is non-flammable found in the atomic structure and daughter products electrons.