The octet rule states that most atoms need electrons in their outer shells.
a. 8
b. 6
c. 2
d. 10

Answer : The correct option is, (A) 8

Explanation :

Octet rule : It is the tendency of atoms to have eight electrons in the valence shell. When the atoms have fewer than eight electrons then they tend to react and form the more stable compounds.

Or we can say that the atoms attempt to get a noble gas electron configuration, which is eight valence electrons.

For example : As we know that the sodium has one valence electron, so if giving it up then the result in the same electron configuration as the neon and chlorine has seven valence electrons, so if it takes one it will have eight and the result in the same electronic configuration as the argon.

Hence, the correct option is, (A) 8