请问如何比较NaCl,MgO,KBr和KCl的熔点
人气：401 ℃ 时间：2020-05-23 15:15:27
解答
通常,离子型化合物的晶格能愈大,其熔点愈高.影响晶格能的主要原因是离子的半径和电荷.Mg2+和O2-半径小,电荷数多,晶格能最大,故熔点最高.K+半径比Na+大,所以KCl的晶格能比NaCl小,熔点低；而Br-半径比Cl-的大,所以KBr的晶格能比KCl的小,其熔点最低.
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