1.

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
Answer» C. 1s2 2s2 2p4


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