Which electronic configuration corresponds to an element of group IIIA ?
(A) 1s2 2s2 2p3
(B) 1s2 2s2 2p6 3s2 3p1
(C) 1s2 2s2 2p4
(D) 1s2 2s2 2p6 3s2 3p6 4s2 3d1
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