atomic number 111
— Navneord
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～ a radioactive transuranic element
atomic number 110
— Navneord
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～ a radioactive transuranic element
atomic number 97
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～ a radioactive transuranic element; discovered by bombarding americium with helium
atomic number 58
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～ a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group
atomic number 68
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～ a trivalent metallic element of the rare earth group; occurs with yttrium
atomic number 55
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～ a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal
atomic number 33
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～ a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar
atomic number 98
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～ a radioactive transuranic element; discovered by bombarding curium with alpha particles
atomic number
— Navneord
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～ the order of an element in Mendeleyev's table of the elements; equal to the number of protons in the nucleus or electrons in the neutral state of an atom of an element
atomic number 86
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～ a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health
atomic number 38
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～ a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite
atomic number 22
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～ a light strong grey lustrous corrosion-resistant metallic element used in strong lightweight alloys (as for airplane parts); the main sources are rutile and ilmenite
atomic number 114
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～ a radioactive transuranic element
atomic number 83
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～ 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 112
— Navneord
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～ a radioactive transuranic element
atomic number 115
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～ a radioactive transuranic element
atomic number 101
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～ a radioactive transuranic element synthesized by bombarding einsteinium with alpha particles (Md is the current symbol for mendelevium but Mv was formerly the symbol)
atomic number 76
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～ a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
atomic number 49
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～ a rare soft silvery metallic element; occurs in small quantities in sphalerite