Answer:
stability and completely filled orbitals
Step-by-step explanation:
As it pertains to valence electrons, "8 is great" means the valence electrons present in the orbital confers stability on the atom as the shell becomes completely filled.
- For an atom to be stable, it must have completely filled outer orbitals.
- The number of electrons required is usually 8.
- This is the octet number which confers special stability on an atomic configuration.
- Elements having this number of electrons in their outer shell are unreactive.