Explanation

A chemical bond formed by the Coulombic interaction between positive and negative ions. When active metal and active nonmetal atoms are close, due to the large difference in electron-negativity between the two sides, metal atoms are easy to lose electrons and become positive ions, while non-metallic atoms are easy to get electrons and become negative ions; When positive and negative ions approach a certain level, the attraction and repulsion between them reach equilibrium, and the system energy is the lowest. Ionic bonds are mainly present in alkali metal halides and also in ionic gas molecules such as LiF vapor. The positive and negative ions in the ionic crystal have a certain proportion relationship, and they are arranged alternately in a certain way in space. Ionic crystal has strong binding force, high melting point, high hardness, difficult to compress and other characteristics.

Classification