Question

=> Why do 8 electrons form a stable shell ? Why not 7, 6, 4, or even 2 ?​

Answer 1

Answer:

This happens because of the octet rule. It refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to react and form more stable compounds. ... When atoms have fewer than eight electrons, they tend to react and form more stable compounds