Question

Please help! I don't understand electron configurations..

1. Find the electron configuration of silicon.

2. State the valence electron configurations for the following elements:
Na :
F :
Ga :
Bi :

If you could explain as well, that would be great!

Answer 1

1. [Ne] 3s² 3p² ( simple formula )

2. Na: 1 valence electron
F: 7 valence electrons
Ga: 3 valence electrons
Bi : 5 valence electrons