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The electronic configuration of copper (29 cu) is:
(1)1s2, 2s2, 2p6, 3s2, 3p6, 3d9, 4s2
(2) 1s2, 2s2, 2p6, 3s2, 3p6, 3d10, 4s1
(3) 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 4p6
(4) 1s2, 2s2, 2p6, 3s2, 3p6, 3d10,
Ans: 1s2, 2s2, 2p6, 3s2, 3p6, 3d10, 4s1
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