Nouns starting with A

• atomic number 72 — Noun – English ～ a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons
• atomic number 10 — Noun – English ～ 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
• atomic number 4 — Noun – English ～ a light strong brittle grey toxic bivalent metallic element
• atomic number 52 — Noun – English ～ a brittle silver-white metalloid element that is related to selenium and sulfur; it is used in alloys and as a semiconductor; occurs mainly as tellurides in ores of copper and nickel and silver and gold
• atomic number 50 — Noun – English ～ a silvery malleable metallic element that resists corrosion; used in many alloys and to coat other metals to prevent corrosion; obtained chiefly from cassiterite where it occurs as tin oxide
• atomic number 8 — Noun – English ～ a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust
• atomic number 78 — Noun – English ～ a heavy precious metallic element; grey-white and resistant to corroding; occurs in some nickel and copper ores and is also found native in some deposits
• atomic number 21 — Noun – English ～ a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite
• atomic number 67 — Noun – English ～ a trivalent metallic element of the rare earth group; occurs together with yttrium; forms highly magnetic compounds
• atomic number 7 — Noun – English ～ a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by volume; a constituent of all living tissues
• atomic number 93 — Noun – English ～ a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium
• atomic number 62 — Noun – English ～ a grey lustrous metallic element of the rare earth group; is used in special alloys; occurs in monazite and bastnasite
• atomic number 40 — Noun – English ～ a lustrous grey strong metallic element resembling titanium; it is used in nuclear reactors as a neutron absorber; it occurs in baddeleyite but is obtained chiefly from zircon
• atomic number 42 — Noun – English ～ a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel
• 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

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