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> 下列关于主族元素的说法正确的是 A．主族元素的原子核外电子最后填入的能级是s能级 B．主族元素的原子核外电子最后填入的能级是s能级或p能级 C．主族元素的价电子数有可能超过最外层电子数 D．主族元素的最高正价一般等于该元素所在主族的族序数

问题：

发布时间：2024-09-08

下列关于主族元素的说法正确的是

A．主族元素的原子核外电子最后填入的能级是s能级

B．主族元素的原子核外电子最后填入的能级是s能级或p能级

C．主族元素的价电子数有可能超过最外层电子数

D．主族元素的最高正价一般等于该元素所在主族的族序数

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