abcder六种元素位于�期表的前四�期其原子序数依次增大.已知a原子核外有三个未成对电子b的最外层电子数是内层电子数的3倍 Template




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tomskiabcder六种元素位于�期表的前四�期其原子序数依次增大.已知a原子核外有三个未成对电子b的最外层电子数是内层电子数的3倍 coloring