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Ionic Formula for Sodium Sulfide
Nowadays, if you want to find the ionic formula for sodium sulfide, you must know its constituent elements and valence states. Sodium, an active metal, has a common valence state of + 1; sulfur, a non-metal, has a valence state of -2 in this compound.
To form a stable compound, the charge of the anion and cation must be balanced. The cation of sodium is $Na ^ {+} $, and the anion of sulfur is $S ^ {2 -} $. In order to balance the charge, the disodium cation needs to be combined with the monosulfur anion, so the ionic formula of sodium sulfide is $Na_ {2} S $.
To form a stable compound, the charge of the anion and cation must be balanced. The cation of sodium is $Na ^ {+} $, and the anion of sulfur is $S ^ {2 -} $. In order to balance the charge, the disodium cation needs to be combined with the monosulfur anion, so the ionic formula of sodium sulfide is $Na_ {2} S $.
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