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In Cu (at. No = 29).

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One electron can have spin only in the clockwise direction

13 electrons have spin in one direction and 16 electrons in other direction

14 electrons have spin in one direction and 15 electrons other direction

None of the above is correct

answer is A.

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Detailed Solution

$_{29} Cu = {[Ar]}^{18} {3d}^{10} {4s}^{1}$ All electrons are paired concept ${4s}^{1}$ . Hence $14 e^{-}$ have spin in one direction and $15 e^{-}$ in the other direction.

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