下列说法正确的是(    ) A.同主族非金属元素的简单阴离子的

下列说法正确的是(   

A.同主族非金属元素的简单阴离子的还原性越强,其元素非金属性越强

B.ⅠA族与A族元素间可形成共价化合物或离子化合物

C.元素原子的最外层电子数等于元素的最高化合价

D.全部由非金属元素组成的化合物中只含共价键

答案

B

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