The isotope po 214 has a half life of only 0 164 seconds. Polonium pɵˈloʊniəm は原子番号84の元素 元素記号は po 安定同位体は存在しない 第16族元素の一つ 銀白色の金属 半金属 常温 常圧で安定な結晶構造は 単純立方晶 α po 36 c以上で立方晶から菱面体晶 β po に構造相転移する. Gentry has shown that polonium halos microspheres of coloration found in the earth s granite foundation rocks are produced by radioactive decay of primordial polonium known to have a fleeting existence thus.
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