What is number of valence electrons for sodium?

Jul 2, 2016

1 valence electron

Explanation:

Electronic configuration of sodium will be 2,8,1. Here 1st and 2nd shells are complete but 3rd shell is not. So 1 valence electron.

Jul 2, 2016

There is one valence electron in a Sodium atom.

Explanation:

The element Sodium is in the 3rd energy level first column of the periodic table. This means the electron configuration for Sodium is

$N a = 1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{1}$

The valence electrons are found in the highest energy level in the $s$ and $p$ orbitals of the atom.

For Sodium this is $3 {s}^{1}$ making one valence electron.