Which one of the following elements exhibit maximum number of valence electrons? (a) Na (b) Al (c) Si (d) P

Soln:

Answer is (d) P

Explanation:

Electronic configuration of Na, Al, Si and P are 2,8 1, 2,8,3,2,8,4, and 2,8,5 respectively. Valence electrons in Na, Al, Si and P are 1,3,4 and 5 Hence phosphorus has maximum number of valence electrons.