How do valence electrons determine the reaction between sodium and chlorine?

Question

A
Sodium atoms have 1 valence electron, and chlorine atoms have 7 valence electrons, so they form NaCl.

B
Sodium atoms have 7 valence electrons, and chlorine atoms have 1 valence electron, so they form NaCl.

C
Sodium atoms have 1 valence electron, and chlorine atoms have 6 valence electrons, so they form Na2Cl.

D
Sodium atoms have 6 valence electrons, and chlorine atoms have 1 valence electron, so they form NaCl2.

Answer 1

A
Sodium atoms have 1 valence electron, and chlorine atoms have 7 valence electrons, so they form NaCl.