1s2 2s2 2p6 3s2 3p6 4s2 3d3A+
[Ar]4s23d2
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[Ar] 4s23d7
The electron configuration of cobalt is [Ar]3d7.4s2.
[Ar] 4s2
[Ar] 4s2 3d10 4p5
electron configuration of galliumis: [Ar]3d104s24p1
[Ar] 3d10 4s2 4p4 or 2, 8, 18, 6
1s2 2s2 2p6 3s2 3p6 4s2 3d3A+
[Ar]4s23d2
[Ar] 4s2 3d5
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1s2 2s2 2p6 3s2 3p6 3d7 4s2Alternatively,[Ar] 3d7 4s2
[Ar] 4s23d7
It is [Ar] 4s2 3d2
The electron configuration of cobalt is [Ar]3d7.4s2.