Question

Criss cross method for patassium iodide

Answer 1

K = +1

I = -1

Hence the formula is KI.

Answer 2

so to the cross method you have to find the valency of K and I

so the valency of K/ pottasium = 1

valenvy of I/ iodine= 1

K     I

1      1

so just draw arrows accros like an x

since both are 1 we just keep it as KI but if it is Hydrogen and Oxygen it wpuld be like this

H    O

1       2

valency of h is 1 and o is 2

cross multiply and we get h20