Question

formula of Barium peroxide by using criss cross method​

Answer 1

Barium - Ba^2+

Valency of Barium - 2

Peroxide - O2^2-

Valency of peroxide- 2

By criss-crossing the valency, we get Ba2(O2) 2

Now if we simplify the subscripts, we get the final answer.

I. e, the formula of Barium Oxide- BaO2