Question
Work out the formulae for the following compounds:
Sodium oxide.

Answer

Sodium oxide:$\ \text{Symbols}:\ \ \ \ \ \text{Na}\ \ \ \ \ \ \ \text{O}$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {\text{Valencies}}:\ +1\ \ \ \ -2$
Thus, the formula of sodium oxide is $\ce{Na2O}$

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