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  • What is the shielding constant experienced by a 3d electron in the selenium atom?Option: 1 21.15Option:

What is the shielding constant experienced by a 3d electron in the selenium atom?

Option: 1

21.15


Option: 2

20.15


Option: 3

22.15


Option: 4

19.51


Answers (1)

best_answer

As we learnt

 

For (d) or (f) electron -

 

1.  Rule 1 to 3 of ns, np remain same while 4 & 5 is replaced by the following.

 2.  All the electron in the group lying left to (nd, nf) group contributes 1.0

-

 

 

Se:1s^22s^22p^63s^23p^64s^23d^{10}4p^5

Se:\left (1s^2 \right ),\left (2s^22p^6 \right ),\left (3s^23p^6 \right ),\left (3d^{10} \right ),\left (4s^24p^4 \right )

Ignore the group to the right of the 3d electrons.

\Rightarrow Shielding\left [ 3d \right ]= 1.00(18)+0.35(9)= 21.15

Posted by

seema garhwal

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