In rules for naming a compound you change the negative name to end in" ide" *

Single-atom negative ions end in “-ide”, so binary compounds always have this ending. Polyatomic compounds usually end in “-ate” or “-ite”. FORMULAS: Write the positive ion, with its charge, then the negative ion, with its charge.

Explanation:

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because if the tool that you are using is not balanced it there would be false mass.