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Question

Which of the following is correct with respect to energy for multi-electron system?

I. 1s<2s II. 2p<3pIII. 3dxy=3dyzIV. 3d>4s


A

I, II

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B

I, II, III

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C

I, II, IV

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D

I, II, III and IV

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Solution

The correct option is D

I, II, III and IV


Let's discuss one by one.

1s<2s Because same 'l' but 'n' value is more for 2s.

2p<3p same reason

3dxy=3dyzBecause all d-orbitals will be denigrate in a particular energy level.

3d>4s(n+l)for3d=3+2=5
(n+l) for 4s=4+0=4

This is because of penetration power.


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