Write the full ground-state electron configuration for each element:
Br
Mg
Se
full ground-state electron configuration for Br , Mg and Se
Br = 1s2 2s2 2p6 3s2 3p6 4s2 3d104p5
Mg = 1s2 2s2 2p6 3s2
Se = 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4
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