atomic number 12
— Noun
– English
～ a light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine)
atomic number 57
— Noun
– English
～ a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth
atomic number 109
— Noun
– English
～ a radioactive transuranic element
atomic number 51
— Noun
– English
～ a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnite
atomic number 34
— Noun
– English
～ a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite)
atomic number 23
— Noun
– English
～ a soft silvery white toxic metallic element used in steel alloys; it occurs in several complex minerals including carnotite and vanadinite
atomic number 66
— Noun
– English
～ a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic
atomic number 11
— Noun
– English
～ a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt)
atomic number 63
— Noun
– English
～ a bivalent and trivalent metallic element of the rare earth group
atomic number 103
— Noun
– English
～ a radioactive transuranic element synthesized from californium
atomic number 37
— Noun
– English
～ a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite
atomic number 29
— Noun
– English
～ 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 18
— Noun
– English
～ a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
atomic number 2
— Noun
– English
～ 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 13
— Noun
– English
～ a silvery ductile metallic element found primarily in bauxite
atomic number 19
— Noun
– English
～ a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite
atomic number 73
— Noun
– English
～ a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
atomic number 43
— Noun
– English
～ a crystalline metallic element not found in nature; occurs as one of the fission products of uranium
atomic number 91
— Noun
– English
～ a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
atomic number 9
— Noun
– English
～ 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