在无机化学教学中经常涉及有关1：1型二元离子型化合物的稳定性问题，同时这也是中学化学教师经常询问的问题。一般说来，如果该类晶体中阴、阳离子半径大小相匹配，则所形成的化合物热稳定性高、在水中的溶解度小；反之则形成的化合物热稳定性差、易溶于水。本文探讨这种关系 Inorganic chemistry teaching often involves the question of the stability of binary 1: 1 binary ionic compounds, which is also a frequently asked question to secondary school chemistry teachers. In general, if the type of crystal in the cathode and cation radius of the size match, then the compounds formed by the high thermal stability, solubility in water is small; the other hand, the formation of compounds poor thermal stability, soluble in water. This article explores this relationship