某短周期非金属元素的原子核外最外层电子数是次外层电子数的一半

更新 2022-09-03
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某短周期非金属元素的原子核外最外层电子数是次外层电子数的一半，该元素

A．在自然界中只以化合态的形式存在	B．单质常用作半导体材料和光导纤维
C．最高价氧化物不与酸反应	D．气态氢化物比甲烷稳定

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