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actinium series |
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actinium series, natural radioactive decay series beginning with uranium uranium (y ..... Click the link for more information. -235 (also called actinouranium) and ending with lead lead, metallic chemical element; symbol Pb [Lat. plumbum]; at. no. 82; at. wt. 207.2; m.p. 327.502°C;; b.p. about 1,740°C;; sp. gr. 11.35 at 20°C;; valence +2 or +4. ..... Click the link for more information. -207. See radioactivity radioactivity, spontaneous disintegration or decay of the nucleus of an atom by emission of particles, usually accompanied by electromagnetic radiation . The energy produced by radioactivity has important military and industrial applications. ..... Click the link for more information. . |
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