Ask a Teacher

for the compound (PtCl4)- how is charge determined?

The question means, the oxidation number of ptCl₄

Oxidation number of Cl - (-1)

Oxidation number of pt - (+2)

Therefore +2 + 4 × (-1) = 2 - 4
                                     = -2

(-2) is the charge of (PtCl₄).