Posted by kelly on Thursday, September 30, 2010 at 6:06pm.
The sum of the oxidation states is zero.
Na is +1, so F must be -1
so what wouldit be for Mg3P2? if it has a subscript?
Mg is +2, so three of them make a +6.
This has to be offset by 2P ions, so each P is -3
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