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  • In Cu (atomic number = 29):Option: 1 13 electrons have spin in one direction and 16 electrons in other direction<div class='qna-option'

In Cu (atomic number = 29):

Option: 1

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


Option: 2

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


Option: 3

One electron can have spin only in the clockwise direction


Option: 4

None of these


Answers (1)

best_answer

 

Stability of Completely filled and Half-filled Subshells -

Stability of completely filled and half-filled subshells 

It is well known that symmetry leads to stability. The completely filled or half-filled subshells have the symmetrical distribution of electrons in them and are therefore more stable.

For eg: the valence electronic configurations of Cr and Cu, therefore, are 3d54s1 and 3d104s1 respectively and not 3d44s2 and 3d94s2.

-

 

As we have learnt,

The electronic configuration of Cu is:
1s22s22p63s23p64s23d9

Thus, Cu has 14 electrons with spin in one direction and 15 electrons in other direction.

Therefore, Option(2) is correct

Posted by

HARSH KANKARIA

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