What the formula fo sodium oxide?
Εδώ είναι γιατί:
* νάτριο (na) has a +1 charge.
* οξυγόνο (o) has a -2 charge.
To balance the charges, you need two sodium ions (+1 each) for every one oxygen ion (-2). This gives you a neutral compound:2(+1) + (-2) =0