You have to make it balanced.

[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
The Balanced chemical equation for the given reaction will be ~
[tex] \large \mathrm{\boxed{ \boxed{4\: Na + O_2} \rightarrow \boxed{ 2\;Na_2O}}}[/tex]