Uranium has the highest atomic weight of the primordially occurring elements. The chemical symbol for Helium is He. Helium is the second most abundant element in the universe. Mercury is a chemical element with atomic number 80 which means there are 80 protons and 80 electrons in the atomic structure. The chemical symbol for Promethium is Pm. Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. Helium is atomic number 2 on the periodic table, with the element symbol He. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. Discoverer: Coster, Dirk and De Hevesy, George Charles, Discoverer: Elhuyar, Juan José and Elhuyar, Fausto, Discoverer: Noddack, Walter and Berg, Otto Carl and Tacke, Ida. Helium is present rarely on the 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. The periodic table is an arrangement of all the elements known to man in accordance with their increasing atomic number and recurring chemical properties. Its properties are thus intermediate between those of chlorine and iodine. Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. 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. Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge. Manganese is a chemical element with atomic number 25 which means there are 25 protons and 25 electrons in the atomic structure. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant. Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name, kohl. Periodic Table of Elements Element Helium - He. The bulk properties of astatine are not known with any certainty. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. Calcium is an alkaline earth metal, it is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Caesium has physical and chemical properties similar to those of rubidium and potassium. Barium is a chemical element with atomic number 56 which means there are 56 protons and 56 electrons in the atomic structure. Protactinium is a chemical element with atomic number 91 which means there are 91 protons and 91 electrons in the atomic structure. Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. (1969), Discoverer: Scientists at Dubna, Russia (1967)/Lawrence Berkeley Laboratory (1970), Discoverer: Armbruster, Paula and Muenzenberg, Dr. Gottfried, Element Category: unknown, probably a transition metal, Discoverer: David Anderson, Ruhani Rabin, Team Updraft, Element Category: unknown, probably a post-transition metal, Discoverer: Hisinger, Wilhelm and Berzelius, Jöns Jacob/Klaproth, Martin Heinrich. Periodic Table What is the Periodic Table? It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Therefore the electronegativity is greatest at the top-right of the periodic table and decreases toward the bottom-left. Major advantage of lead shield is in its compactness due to its higher density. These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements. The chemical symbol for Calcium is Ca. Very soft and malleable, indium has a melting point higher than sodium and gallium, but lower than lithium and tin. Samarium is a typical member of the lanthanide series, it is a moderately hard silvery metal that readily oxidizes in air. Origin of Name: From the Greek word helios, meaning sun: Date and Place of Discovery: 1868 in France and in England 1895 in England: Discovered by: Pierre Janssen in France first noticed a bright yellow line during an eclipse (1868); Norman Lockyer in England noticed a yellow line in the solar spectrum (1868); Sir William Ramsay discovered helium on earth (1895) Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. Copper is a chemical element with atomic number 29 which means there are 29 protons and 29 electrons in the atomic structure. The chemical symbol for Magnesium is Mg. Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. However, it is the 2ndmost abundant element in the universe . The chemical symbol for Scandium is Sc. The chemical symbol for Europium is Eu. In fact their absorption cross-sections are the highest among all stable isotopes. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. The chemical symbol for Ruthenium is Ru. The chemical symbol for Cerium is Ce. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. 1) You may use almost everything for non-commercial and educational use. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. The chemical symbol for Bromine is Br. Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. Bromine is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. The chemical symbol for Tantalum is Ta. When shown an element name, find the corresponding element atomic number and symbol in the periodic table as quickly as you can!. Silicon is a hard and brittle crystalline solid with a blue-grey metallic lustre, it is a tetravalent metalloid and semiconductor. Helium atoms have 2 electrons and the shell structure is 2. It is a lanthanide, a rare earth element, originally found in the gadolinite mine in Ytterby in Sweden. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. 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 higher the associated electronegativity number, the more an element or compound attracts electrons towards it. The chemical symbol for Neodymium is Nd. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten. Manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. Berkelium is a member of the actinide and transuranium element series. Electronegativity is related with ionization energy and electron affinity. Tellurium is chemically related to selenium and sulfur. Lithium is a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. Sodium is an alkali metal, being in group 1 of the periodic table, because it has a single electron in its outer shell that it readily donates, creating a positively charged atom—the Na+ cation. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. Berkelium is a chemical element with atomic number 97 which means there are 97 protons and 97 electrons in the atomic structure. Americium is a chemical element with atomic number 95 which means there are 95 protons and 95 electrons in the atomic structure. It is occasionally found in native form as elemental crystals. Niobium is a chemical element with atomic number 41 which means there are 41 protons and 41 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. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. Pure radium is silvery-white alkaline earth metal. Complete and detailed technical data about the element Helium in the Periodic Table. 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. 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. The chemical symbol for Zinc is Zn. The chemical symbol for Caesium is Cs. It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities. To find out more, see our, “Calculation of the relative speed of sound in a gas mixture”. www.nuclear-power.net. The chemical symbol for Holmium is Ho. Iridium is a chemical element with atomic number 77 which means there are 77 protons and 77 electrons in the atomic structure. Compare Helium and Carbon. Titanium is resistant to corrosion in sea water, aqua regia, and chlorine. Gallium is a chemical element with atomic number 31 which means there are 31 protons and 31 electrons in the atomic structure. The chemical symbol for Terbium is Tb. The chemical symbol for Lawrencium is Lr. These condensers use tubes that are usually made of stainless steel, copper alloys, or titanium depending on several selection criteria (such as thermal conductivity or corrosion resistance). Boron is a chemical element with atomic number 5 which means there are 5 protons and 5 electrons in the atomic structure. Elemental sulfur is a bright yellow crystalline solid at room temperature. Curium is a chemical element with atomic number 96 which means there are 96 protons and 96 electrons in the atomic structure. Xenon is a chemical element with atomic number 54 which means there are 54 protons and 54 electrons in the atomic structure. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. The chemical symbol for Astatine is At. al. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. Period in periodic table: 1. Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. Iron is a metal in the first transition series. Pure germanium is a semiconductor with an appearance similar to elemental silicon. It is one of the least reactive chemical elements and is solid under standard conditions. Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 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. Because of its high chemical reactivity, barium is never found in nature as a free element. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. Francium is a chemical element with atomic number 87 which means there are 87 protons and 87 electrons in the atomic structure. Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. The chemical symbol for Rhenium is Re. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. The chemical symbol for Palladium is Pd. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). In nuclear reactors, promethium equilibrium exists in power operation. Learn about the properties of helium, the history of the discovery of helium, and the uses of helium in this brief video. Actinium is a soft, silvery-white radioactive metal. The chemical symbol for Lutetium is Lu. Nearly all technetium is produced synthetically, and only minute amounts are found in the Earth’s crust. The chemical symbol for Beryllium is Be. The chemical symbol for Arsenic is As. All of its isotopes are radioactive. Chemically, indium is similar to gallium and thallium. Electrons with low ionization energies have low electronegativities because their nuclei do not exert a strong attractive force on electrons. All of the alkali metals have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge – a cation, which combines with anions to form salts. It is present at about 24% of the total elemental mass, which is more than 12 times the mas… Europium is a moderately hard, silvery metal which readily oxidizes in air and water. The chemical symbol for Yttrium is Y. Yttrium is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a “rare-earth element”. Helium and neon, the two lightest noble gases, have been traditionally positioned by IUPAC in the Group 18 of the Periodic Table of Elements, together with argon, and other unreactive or moderately reactive gaseous elements (krypton, xenon, radon), and oganesson. The chemical symbol for Silver is Ag. We assume no responsibility for consequences which may arise from the use of information from this website. Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. The chemical symbol for Praseodymium is Pr. Detailed decay information for the isotope helium-3 including decay chains and daughter products. The chemical symbol for Titanium is Ti. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. The atmospheric content of helium on the Earth is only 5.2 ppm . Although neodymium is classed as a rare earth, it is a fairly common element. Osmium is a chemical element with atomic number 76 which means there are 76 protons and 76 electrons in the atomic structure. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. Rutherford and Royds in 1907 demonstrated that alpha particles are helium nuclei. For this purposes, a dimensionless quantity the Pauling scale, symbol χ, is the most commonly used. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. The chemical symbol for Mendelevium is Md. Carbon is one of the few elements known since antiquity. The name samarium is after the mineral samarskite from which it was isolated. The chemical symbol for Nickel is Ni. The chemical symbol for Copper is Cu. Lawrencium is the final member of the actinide series. The chemical symbol for Helium is He. Medium Game Level. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. Commercially, thallium is produced as a byproduct from refining of heavy metal sulfide ores. Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong resistance to corrosion. The chemical symbol for Actinium is Ac. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. Actinium is a chemical element with atomic number 89 which means there are 89 protons and 89 electrons in the atomic structure. CAS Registry: 7440-59-7. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. The chemical symbol for Plutonium is Pu. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere and is often used with other rare gases in fluorescent lamps. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. The helium atom is trapped inside a fullerene which is made up entirely of carbon. But its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. Interactive periodic table showing names, electrons, and oxidation states. Helium is the second element on the periodic table, with atomic number 2 and element symbol He. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. 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. Fermium is a member of the actinide series. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. Visualize trends, 3D orbitals, isotopes, and mix compounds. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry. Like all elements with atomic number over 100, lawrencium can only be produced in particle accelerators by bombarding lighter elements with charged particles. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Common chemical compounds are also provided for many elements. Atmosphere, at 0.934 % ( 9340 ppmv ) chemical properties are most similar to gallium and thallium a impact... 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