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Q.

In Cu. Atomic number of copper is 29.          

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a

one electron can have spin only in the clockwise direction

b

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

c

None of the above is correct

d

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

answer is B.

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Detailed Solution

electronic configuration of Cu.(29) =1s22s23s23p64s13d10

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