Which electronic configuration corresponds to an element of group IIIA?

Question:Which electronic configuration corresponds to an element of group IIIA?

1.1s2 2s2 2p3

2.1s2 2s2 2p6 3s2 3p1

3.1s2 2s2 2p4

4.1s2 2s2 2p6 3s2 3p6 4s2 3d1


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