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• allotrope go
  a structurally different form of an element
  
• transuranic element go
  any element having an atomic number greater than 92 (which is the atomic number of uranium)
  
• noble gas, inert gas, argonon go
  any of the chemically inert gaseous elements of the helium group in the periodic table
  
• metal, metallic element go
  any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
  
• nonmetal go
  a chemical element lacking typical metallic properties
  
• transactinide go
  any of the artificially produced elements with atomic numbers greater than 103
  
• actinium, Ac, atomic number 89 go
  a radioactive element of the actinide series
  
• argon, Ar, atomic number 18 go
  a colorless and odorless inert gas
  
• arsenic, As, atomic number 33 go
  a very poisonous metallic element that has three allotropic forms
  
• astatine, At, atomic number 85 go
  a highly unstable radioactive element (the heaviest of the halogen series)
  
• bohrium, Bh, element 107, atomic number 107 go
  a transuranic element
  
• B, boron, atomic number 5 go
  a trivalent metalloid element
  
• bromine, Br, atomic number 35 go
  a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens
  
• carbon, C, atomic number 6 go
  an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond
  
• chlorine, Cl, atomic number 17 go
  a common nonmetallic element belonging to the halogens
  
• darmstadtium, Ds, element 110, atomic number 110 go
  a radioactive transuranic element
  
• dubnium, Db, hahnium, element 105, atomic number 105 go
  a transuranic element
  
• F, fluorine, atomic number 9 go
  a nonmetallic univalent element belonging to the halogens
  
• Ge, germanium, atomic number 32 go
  a brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors
  
• hassium, Hs, element 108, atomic number 108 go
  a radioactive transuranic element
  
• helium, He, atomic number 2 go
  a very light colorless element that is one of the six inert gasses
  
• H, hydrogen, atomic number 1 go
  a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas
  
• iodine, I, iodin, atomic number 53 go
  a nonmetallic element belonging to the halogens
  
• krypton, Kr, atomic number 36 go
  a colorless element that is one of the six inert gasses
  
• lawrencium, Lr, atomic number 103 go
  a radioactive transuranic element synthesized from californium
  
• meitnerium, Mt, element 109, atomic number 109 go
  a radioactive transuranic element
  
• mendelevium, Md, Mv, atomic number 101 go
  a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol)
  
• neon, Ne, atomic number 10 go
  a colorless odorless gaseous element that give a red glow in a vacuum tube
  
• N, nitrogen, atomic number 7 go
  a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas
  
• nobelium, No, atomic number 102 go
  a radioactive transuranic element synthesized by bombarding curium with carbon ions
  
• O, oxygen, atomic number 8 go
  a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas
  
• P, phosphorus, atomic number 15 go
  a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells
  
• plutonium, Pu, atomic number 94 go
  a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons
  
• radon, Rn, atomic number 86 go
  a radioactive gaseous element formed by the disintegration of radium
  
• roentgenium, Rg, element 111, atomic number 111 go
  a radioactive transuranic element
  
• rutherfordium, Rf, unnilquadium, Unq, element 104, atomic number 104 go
  a radioactive transuranic element which has been synthesized
  
• seaborgium, Sg, element 106, atomic number 106 go
  a transuranic element
  
• selenium, Se, atomic number 34 go
  a toxic nonmetallic element related to sulfur and tellurium
  
• silicon, Si, atomic number 14 go
  a tetravalent nonmetallic element
  
• S, sulfur, sulphur, atomic number 16 go
  an abundant tasteless odorless multivalent nonmetallic element
  
• tellurium, Te, atomic number 52 go
  a brittle silver-white metalloid element that is related to selenium and sulfur
  
• ununbium, Uub, element 112, atomic number 112 go
  a radioactive transuranic element
  
• ununhexium, Uuh, element 116, atomic number 116 go
  a radioactive transuranic element
  
• ununpentium, Uup, element 115, atomic number 115 go
  a radioactive transuranic element
  
• ununquadium, Uuq, element 114, atomic number 114 go
  a radioactive transuranic element
  
• ununtrium, Uut, element 113, atomic number 113 go
  a radioactive transuranic element
  
• xenon, Xe, atomic number 54 go
  a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts
  
• trace element go
  an element that occurs at very small quantities in the body but is nonetheless important for many biological processes