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8. The complete electron configuration of Gallium, element 31 is
A.1s2 2s2 2p6 3s2 3p6 4s2 3d10.
B.1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1
C.1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4
D.1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2
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