
Na(2,8,1) + IE --> Na+(2,8) + 1e
Cl(2,8,7) +1e --> Cl-(2,8,8) + EA
However, there is a slightly repulsion of the inner electrons of Na+ and outer electrons of Cl-.
Attraction of different charges and repulsion of electrons are occured among all Na+ ions and all Cl- ions, then they are closely together and form a cristall. The ratio of Na+ and Cl- = 1 : 1. The chemical formula of this compound is named emphirical formula, that is NaCl.
When barium ions, Ba2+ combine with Cl- ions, the formula is BaCl2, because the ratio of Ba2+ and Cl- = 1 : 2. Ba2+ + 2Cl- --> BaCl2.
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