Which of the following is not a correct formula? a)ba2o b)ca3n2 c)kcl d)li2s

- A. is not the correct formula.

Explanations:- Charge for Ba is +2 and charge for O is -2, Here the charges are in equal and opposite so their ratio is 1:1 and hence the formula must be BaO and not .

Rest of the formulas are correct as charge for Ca is +2 and charge for N is -3 . On criss cross we get the formula .

Charge for K is +1 and charge for Cl is -1 and so KCl is correct.

Charge for Li is +1 and that for S is -2. On criss cross we get the formula .

indium, and thallium have three electrons i think