chemical element (redirected from Elemental substance)

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chemical element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter element substance - the real physical matter of which a person or thing consists; "DNA is the substance of our genes" atom - (physics and chemistry) the smallest component of an element having the chemical properties of the element allotrope - a structurally different form of an element; "graphite and diamond are allotropes of carbon" transuranic element - any element having an atomic number greater than 92 (which is the atomic number of uranium); all are radioactive argonon, inert gas, noble gas - any of the chemically inert gaseous elements of the helium group in the periodic table metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. nonmetal - a chemical element lacking typical metallic properties transactinide - any of the artificially produced elements with atomic numbers greater than 103 Ac, actinium, atomic number 89 - a radioactive element of the actinide series; found in uranium ores Ar, argon, atomic number 18 - a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere As, atomic number 33, arsenic - a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar astatine, At, atomic number 85 - a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium atomic number 107, Bh, bohrium, element 107 - a transuranic element atomic number 5, boron, B - a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder atomic number 35, Br, bromine - a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water atomic number 6, carbon, C - an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds atomic number 17, chlorine, Cl - a common nonmetallic element belonging to the halogens; best known as a heavy yellow irritating toxic gas; used to purify water and as a bleaching agent and disinfectant; occurs naturally only as a salt (as in sea water) atomic number 110, darmstadtium, Ds, element 110 - a radioactive transuranic element atomic number 105, Db, dubnium, element 105, hahnium - a transuranic element atomic number 9, fluorine, F - a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite atomic number 32, Ge, germanium - a brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite atomic number 108, element 108, hassium, Hs - a radioactive transuranic element atomic number 2, He, helium - a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas) atomic number 1, H, hydrogen - a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe atomic number 53, I, iodin, iodine - a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks) atomic number 36, Kr, krypton - a colorless element that is one of the six inert gasses; occurs in trace amounts in air atomic number 103, lawrencium, Lr - a radioactive transuranic element synthesized from californium atomic number 109, element 109, meitnerium, Mt - a radioactive transuranic element atomic number 101, Md, mendelevium, Mv - a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol)