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How to get sulphate ion minus 2 change?

Answer» ATOMIC no of SULPHUR is 16
so we find out valency of sulphur
k=2,l=8,m=6 so those ions WHOSE last electron is 5,6,7 they RECEIVE charge from other
so in sulphur last ions is 6 so they receive 2H charges from other.
so sulphur has 2 minus charge


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