(n) the order of an element in Mendeleyev's table of the elements; equal to the number of protons in the nucleus or electrons in the neutral state of an atom of an element

actinium

(n) a radioactive element of the actinide series; found in uranium ores, Syn. Ac, atomic number 89

aluminum

(n) a silvery ductile metallic element found primarily in bauxite, Syn. atomic number 13, Al, aluminium

americium

(n) a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms, Syn. atomic number 95, Am

antimony

(n) a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnite, Syn. Sb, atomic number 51

argon

(n) a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere, Syn. Ar, atomic number 18

arsenic

(n) 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, Syn. atomic number 33, As

astatine

(n) a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium, Syn. At, atomic number 85

barium

(n) a soft silvery metallic element of the alkali earth group; found in barite, Syn. atomic number 56, Ba

berkelium

(n) a radioactive transuranic element; discovered by bombarding americium with helium, Syn. atomic number 97, Bk

beryllium

(n) a light strong brittle grey toxic bivalent metallic element, Syn. Be, glucinium, atomic number 4

bismuth

(n) a heavy brittle diamagnetic trivalent metallic element (resembles arsenic and antimony chemically); usually recovered as a by-product from ores of other metals, Syn. Bi, atomic number 83

bohrium

(n) a transuranic element, Syn. element 107, Bh, atomic number 107

boron

(n) a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder, Syn. atomic number 5, B

bromine

(n) a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water, Syn. Br, atomic number 35

cadmium

(n) a soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores, Syn. atomic number 48, Cd

calcium

(n) a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals, Syn. atomic number 20, Ca

californium

(n) a radioactive transuranic element; discovered by bombarding curium with alpha particles, Syn. atomic number 98, Cf

carbon

(n) an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds, Syn. atomic number 6, C

cerium

(n) a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group, Syn. Ce, atomic number 58

cesium

(n) a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal, Syn. Cs, caesium, atomic number 55

chlorine

(n) 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), Syn. Cl, atomic number 17

chromium

(n) a hard brittle multivalent metallic element; resistant to corrosion and tarnishing, Syn. Cr, atomic number 24

cobalt

(n) a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition, Syn. atomic number 27, Co

copper

(n) a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductor, Syn. atomic number 29, Cu

curium

(n) a radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei, Syn. atomic number 96, Cm

darmstadtium

(n) a radioactive transuranic element, Syn. atomic number 110, element 110, Ds

dubnium

(n) a transuranic element, Syn. element 105, hahnium, Db, atomic number 105

dysprosium

(n) a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic, Syn. atomic number 66, Dy

einsteinium

(n) a radioactive transuranic element produced by bombarding plutonium with neutrons, Syn. Es, atomic number 99, E

erbium

(n) a trivalent metallic element of the rare earth group; occurs with yttrium, Syn. atomic number 68, Er

europium

(n) a bivalent and trivalent metallic element of the rare earth group, Syn. atomic number 63, Eu

fermium

(n) a radioactive transuranic metallic element produced by bombarding plutonium with neutrons, Syn. Fm, atomic number 100

fluorine

(n) 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, Syn. atomic number 9, F

francium

(n) a radioactive element of the alkali-metal group discovered as a disintegration product of actinium, Syn. Fr, atomic number 87

gadolinium

(n) a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group, Syn. atomic number 64, Gd

gallium

(n) a rare silvery (usually trivalent) metallic element; brittle at low temperatures but liquid above room temperature; occurs in trace amounts in bauxite and zinc ores, Syn. Ga, atomic number 31

germanium

(n) a brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite, Syn. atomic number 32, Ge

gold

(n) a soft yellow malleable ductile (trivalent and univalent) metallic element; occurs mainly as nuggets in rocks and alluvial deposits; does not react with most chemicals but is attacked by chlorine and aqua regia, Syn. Au, atomic number 79

hafnium

(n) a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons, Syn. atomic number 72, Hf

hassium

(n) a radioactive transuranic element, Syn. Hs, atomic number 108, element 108

helium

(n) 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), Syn. atomic number 2, He

holmium

(n) a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds, Syn. Ho, atomic number 67

hydrogen

(n) 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, Syn. atomic number 1, H

indium

(n) a rare soft silvery metallic element; occurs in small quantities in sphalerite, Syn. In, atomic number 49

iodine

(n) 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), Syn. I, atomic number 53, iodin

iridium

(n) a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium, Syn. Ir, atomic number 77

iron

(n) a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood, Syn. Fe, atomic number 26

krypton

(n) a colorless element that is one of the six inert gasses; occurs in trace amounts in air, Syn. Kr, atomic number 36

lanthanum

(n) a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth, Syn. atomic number 57, La

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