The phosphorus anion (P^-) has how many total electrons and how many valence electrons?

Question

1. 15:5
2. 14:6
3.14:5
4.16:5
5. 16:4
6. 15:4
7. 14:4
8. 15:6
9 16.6

I chose answer #1, but obviously its wrong. I need your help, btw how did you come up with your answer (ty).

Answer 1

i think it is the # 1

Answer 2

phosphorus has an atomic number Z=15 if you have a neutral atom of P, it should have 15 electrons.
But you have P- this means 1 electron more than protons so 15+1=16 electrons
the electronic shell of that atom is
1s2 2s2 2p6 3s2 3p4

so on tne valence 3 shell you have 2+4=6 electrons
answer 9