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    【题目】原子序数为11～17号的元素，随核电荷数的递增，以下各项内容的变化是［填“增大（强）”、“减小（弱）”或“相同（不变）”］。

    （1）各元素的原子半径依次_________，其原因是____________。

    （2）各元素原子的电子层数__________，最外层电子数依次_____________。

    （3）元素的金属性逐渐__________ ，而非金属性逐渐__________，元素失电子能力逐渐__________ ，得电子能力逐渐__________ 。

    【答案】（1）减小 电子层数相同时，随核电荷数增大，原子核对外层电子的引力增大，因此原子半径减小（2）相同 增大（3）减弱 增强 减弱 增强

    【解析】原子序数为11～17号的元素，在周期表中位于第三周期，根据同一周期元素原子的结构和性质的变化，可解答本题。

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