天气预报 > 其他 > 氢是第几周期第几族
氢是第几周期第几族
更新时间: 2020-10-31 00:00:00  

氢是第一周期0族。氢是原子序数为1的化学元素,化学符号为H(Hydrogenium),在元素周期表中位于第一位。其原子质量为1.00794u,是最轻的元素,也是宇宙中含量最多的元素,大约占据宇宙质量的75%。主星序上恒星的主要成分都是等离子态的氢。而在地球上,自然条件形成的游离态的氢单质相对罕见。

关键词: 周期

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