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|Noun||1.||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|
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 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 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 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 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)
atomic number 10, Ne, neon - a colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts