# How many valence electrons does "Na" have?

Aug 4, 2016

Sodium has $1$ valence electron.

#### Explanation:

Your tool of choice here will be the Periodic Table of Elements.

Grab one and look for sodium, $\text{Na}$. You'll find it located in period $3$, group $1$.

The thing to remember about main-group elements, which are those elements located in groups $1$, $2$, and $13$ through $18$, is that their group number tells you the number of valence electrons.

In your case, sodium is located in group $1$, which means that it has $1$ valence electron. This valence electron is located in sodium's third energy shell.