abcdef为�期表中前四�期的六种元素它们的原子序数依次增大且均不同族.abc三种元素的基态原子具有相同的能层和能级且第 Template




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tomskiabcdef为�期表中前四�期的六种元素它们的原子序数依次增大且均不同族.abc三种元素的基态原子具有相同的能层和能级且第 coloring