试题与答案

(6分)(1)A元素原子核外M层电子数是L层电子数的一半,请写出 A元素基态时核

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题目:

(6分)(1)A元素原子核外M层电子数是L层电子数的一半,请写出

A元素基态时核外电子排布式:                                

(2)B原子的最外层电子排布式为nsnnp2n  ,则B元素在元素周期表的中位置为第             周期            族。                    

(3)人们常将在同一原子轨道上运动的,自旋方向相反的2个电子,称为“电子对”;将在同一原子轨道上运动的单个电子,称为“未成对电子”。那么硫原子的“未成对电子” 有                         个。                          

答案:

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