A: Calcium (Ca)B: Fluorine (F)C: Aluminum (Al)D: Oxygen (O)
Each atom will gain or lose (whichever is less) electrons until its valence (outer) shell is a filled octetACalcium will lose 2 to become Ca 2+ BFluorine will gain 1 to become F 1- CAluminum will lose3 to become Al 3+ DOxygen will lose 2 to become O 2-
