Alpha-uranium

…Periodic table element symbol = U Atomic number = 92 Atomic weight = 238.0289 Abundance in the earth's crust = 2.7 ppm (47th place) Stable nuclide abundance ratio ²³⁴ U = 0.0057%, ²³⁵ U = 0.7196%, ²³⁸ U = 99.276% Melting point = 1133°C Boiling point = 3818°C Specific gravity = 19.050 (α-uranium), 18.11 (β-uranium, 720°C), 18.06 (γ-uranium, 805°C) Electron configuration = [Rn]5f ³ 6d ¹ 7s ² Main oxidation numbers = II, III, IV, V, VI An important naturally occurring radioactive element, one of the actinides belonging to the IIIA group of the periodic table. The Japanese name uranium is a colloquial name. …

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Source | Heibonsha World Encyclopedia 2nd Edition | Information

…周期表元素記号＝U　原子番号＝92原子量＝238.0289地殻中の存在度＝2.7ppm(47位)安定核種存在比　²³⁴U＝0.0057％，²³⁵U＝0.7196％，²³⁸U＝99.276％融点＝1133℃　沸点＝3818℃比重＝19.050(α‐ウラン)，18.11(β‐ウラン，720℃)，18.06(γ‐ウラン，805℃)電子配置＝[Rn]5f³6d¹7s²おもな酸化数＝II,III,IV,V,VI天然に存在する重要な放射性元素で，周期表第IIIA族に属するアクチノイドの一つ。日本語名のウラニウムは俗称。…

※「α-ウラン」について言及している用語解説の一部を掲載しています。

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