The correct electronic configuration of atom having atomic number ’13’ is:

(A) 1S2, 2S2, 2P6, 3S2, 3P2
(B) 1S2, 2S2, 2P6, 3S2, 3P1
(C) 1S2, 2P6, 3S2, 3P3
(D) 1S2, 2S2, 3S2, 3P6, 4S1

Answer: (B) 1S2, 2S2, 2P6, 3S2, 3P1