图1是元素周期表的一部分,下列说法中错误的是( ) 图1 A.三种元素的

1是元素周期表的一部分,下列说法中错误的是(  )

1

A.三种元素的原子最外层电子数均小于4

B.CNO的原子序数依次增加

C.氧的相对原子质量为16.00

D.氮原子的核外电子数为7

答案

答案 A 碳、氮、氧三种元素的原子结构示意图分别为,三种元素的原子最外层电子数分别为456,都不小于4,A错误。

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