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Write the formula of the compound formed...

Write the formula of the compound formed by each of the following pairs of ions.
(a) `Ca^(2+) and PO_(4)^(3-)`
(b) `Na^(+) and S_(2)O_(3)^(2-)`
(c) `Mg^(2+) and N^(3-)`
(d) `Mn^(2+) and O^(2-)`
(e) `Ba^(2+) and S^(2-)`
(f) `NO_(3)^(-) and Mg^(2+)`

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