Answer:
Sodium (Na): Atomic no. 11
Magnesium (Mg): atomic no. 12
Aluminum (Al): atomic no. 13
Silicon (Si): Atomic no. 14
Phosphorus (P): Atomic no. 15
Sulfur (S): Atomic no. 16
Chlorine (Cl): Atomic no. 17
From the above electronic configuration, it's clear that none of the elements have complete outer shells.
