Nouns starting with A

• 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
• atomic number 36 — Noun – English ～ a colorless element that is one of the six inert gasses; occurs in trace amounts in air
• atomic number 17 — Noun – English ～ 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 15 — Noun – English ～ a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms
• atomic number 80 — Noun – English ～ a heavy silvery toxic univalent and bivalent metallic element; the only metal that is liquid at ordinary temperatures
• atomic number 113 — Noun – English ～ a radioactive transuranic element
• atomic number 60 — Noun – English ～ a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium

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