问题 选择题

元素周期表和元素周期律是学习化学的重要工具,可以帮助我们推测元素及其化合物的结构和性质。某元素的原子序数为7,下列有关该元素的推断不正确的是(    )

A.它处于元素周期表中第二周期ⅤA族

B.它的最高正价为+5,负价为-3

C.它的最高价氧化物对应水化物是一种强酸

D.它的非金属性比磷弱

答案

答案:D

原子序数为7的元素,是氮元素,其原子电子层数为2,最外层有5个电子。故A、B、C项正确。氮和磷在同一主族,随原子序数递增,非金属性逐渐减弱,故D项说法是不正确的。

阅读理解

阅读理解。

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B. 3.5 hours 

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