aleph-null
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～ the smallest infinite integer
algebraic number
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～ root of an algebraic equation with rational coefficients
Avogadro's number
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～ the number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000)
Avogadro number
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～ the number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000)
atomic number 87
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～ a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
atomic number 94
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～ a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239
atomic number 30
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～ a bluish-white lustrous metallic element; brittle at ordinary temperatures but malleable when heated; used in a wide variety of alloys and in galvanizing iron; it occurs naturally as zinc sulphide in zinc blende
atomic number 35
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～ a nonmetallic heavy volatile corrosive dark brown liquid element belonging to the halogens; found in sea water
atomic number 61
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～ a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium
atomic number 96
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～ a radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei
atomic number 56
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～ a soft silvery metallic element of the alkali earth group; found in barite
atomic number 27
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～ a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
atomic number 53
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～ 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)
atomic number 14
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～ a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semiconductor in transistors
atomic number 5
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～ a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder
atomic number 65
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～ a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite
atomic number 45
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～ a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum
atomic number 70
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～ a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime
atomic number 48
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～ a soft bluish-white ductile malleable toxic bivalent metallic element; occurs in association with zinc ores
atomic number 1
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～ 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