Question

write down the formula of sodium oxide (by valency)​

Answer 1

Answer:

NA2OH

Valency of Sodium - +1

Valency of Oxide- -2

So by the crisscross method the one s r being cancelled and so only NA2OH is left..

Hope it helps :)♥️

Sorry for the previous mistake ;(

Answer 2

Answer:

Na2O2

Explanation:

Na+ and O2 -1/2

oxygen forms peroxide ion with sodium