Dear Madam,
What is the molecular formula of potassium manganate and potassium permangnate and how to find usin valency with criss cross method.

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Solution

Manganate ion has a formula MnO₄^2- .Therefore, the formula of potassium manganate is K₂MnO₄.Here, valency of K is 1 and manganante is 2.
And
Permanganate ion is MnO₄^-. So, the formula of potassium permanganate is KMnO₄. Here, valency of K is 1 and permanganante is also 1.

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