Question

please help me with this question...<br />by criss cross method writing formula​

Answer 1

1.Mg(2) and OH(1)

exchanging valencies

Mg(OH)₂

2.Na(1) and HSO₄

exchanging valencies

NaHSO₄

3.K(1) and CO₃(2)

exchanging valencies

K₂CO₃

4.Fe(2) and SO₄ (2)

exchanging valencies

FeSO₄

5.Carbon does not gain or loose electrons as it has 4 in its outermost shell therefore it shares electrons.

So CO₂ is made of sharing electrons and not by exchanging

6.Mg(2) and NO₃ (1)

exchanging valencies

Mg(NO₃)₂

7.Cu(2) and SO₄(2)

exchanging valencies

CuSO₄