问题 选择题

下列说法中,错误的是(  )

A.非金属元素的原子,最外层电子的数目一般多于或等于4个

B.任何原子核内都有质子和中子

C.图是钠离子的结构示意图

D.原子由原子核和核外电子构成

答案

A、非金属元素的原子,最外层电子的数目一般多于或等于4个,易得电子变成阴离子,故A正确;

B、氢原子核内只有质子没有中子,故B错误;

C、钠原子最外层只有一个电子,所以钠离子将最外层一个电子失去,使次外层变为最外层,故C正确;

D、原子就是由原子核和核外电子构成,故D正确.

故选B.

阅读理解

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问答题 简答题