某元素的离子带2个单位正电荷它的核外电子排布为此元素在�期表中的位置是 A.第二�期零族b.第三�期Ⅱa族c.第二�期Ⅵa族d.第三 Template




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tomski某元素的离子带2个单位正电荷它的核外电子排布为此元素在�期表中的位置是 a.第二�期零族b.第三�期Ⅱa族c.第二�期Ⅵa族d.第三 coloring