题目内容

【题目】下列有关原子结构和元素周期律的表述正确的是（ ）

①原子序数为15的元素的原子半径小于N原子半径

②第ⅦA族元素是同周期中非金属性最强的元素

③第二周期第ⅣA族元素的氢化物的稳定性大于NH3

④原子序数为12的元素的最高价氧化物对应水化物的碱性大于Al（OH）3

A.①② B.①③ C.②④ D.③④

【答案】C

【解析】本题考查原子结构与元素周期律。①原子序数为15的元素为磷，其原子半径大于N原子半径，错误；②在周期表中，同一周期，从左至右元素非金属性逐渐增强，卤素是同周期中非金属性最强的元素，正确；③第二周期第ⅣA族元素是碳，它的氢化物为CH4，稳定性小于NH3，错误；④原子序数为12的元素是镁，Mg（OH）2的碱性大于Al（OH）3，正确。

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