How many valence electrons does this contain... 1s^2 2s^2 2p^4 HOw do you figure this out

6

Explanation:

The electronic configuration of the atom is:

            1s² 2s² 2p⁴

The valence electrons are the electrons in the outermost shell of an atom. The number electrons in the highest orbitals with the highest quantum number will determine the valency of the atom.

 For the given atom:

         2s² 2p⁴ is the orbital  = 2 + 4  = 6

There are 6 valence electrons in the given atom