heavy metal - a metal of relatively high density (specific gravity greater than about 5) or of high relative atomic weight

chemical element, 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

noble metal - any metal that is resistant to corrosion or oxidation

Al, aluminium, aluminum, atomic number 13 - a silvery ductile metallic element found primarily in bauxite

Am, americium, atomic number 95 - a radioactive transuranic metallic element; discovered by bombarding uranium with helium atoms

antimony, atomic number 51, Sb - a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnite

atomic number 56, Ba, barium - a soft silvery metallic element of the alkali earth group; found in barite

atomic number 97, berkelium, Bk - a radioactive transuranic element; discovered by bombarding americium with helium

atomic number 4, Be, beryllium, glucinium - a light strong brittle gray toxic bivalent metallic element

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

atomic number 48, cadmium, Cd - a soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores

atomic number 20, Ca, calcium - 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

atomic number 98, californium, Cf - a radioactive transuranic element; discovered by bombarding curium with alpha particles

atomic number 58, Ce, cerium - a ductile gray metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group

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

atomic number 24, chromium, Cr - a hard brittle blue-white multivalent metallic element; resistant to corrosion and tarnishing

atomic number 27, cobalt, Co - a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition

atomic number 29, copper, Cu - 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

atomic number 96, curium, Cm - a radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei

atomic number 66, Dy, dysprosium - a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic

atomic number 99, einsteinium, Es, E - a radioactive transuranic element produced by bombarding plutonium with neutrons

atomic number 68, Er, erbium - a trivalent metallic element of the rare earth group; occurs with yttrium

atomic number 63, Eu, europium - a bivalent and trivalent metallic element of the rare earth group

atomic number 100, fermium, Fm - a radioactive transuranic metallic element produced by bombarding plutonium with neutrons

atomic number 87, Fr, francium - a radioactive element of the alkali-metal group discovered as a disintegration product of actinium

atomic number 64, gadolinium, Gd - a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group

atomic number 31, gallium, Ga - 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

atomic number 72, hafnium, Hf - a gray tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons