Write the electron configuration of cu and also mention the period which it belongs to ??
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(i) electronic configuration of cu = 1s²,2s²,2p6,3s²,3p6,3d10,4s¹
or
[Ar]3d10,4s¹
(ii) belongs to 4 period
or
[Ar]3d10,4s¹
(ii) belongs to 4 period
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