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In a malti-electrons atom which of the ...

In a malti-electrons atom which of the following orbitals deseribed by the three quantum number will have the same energy in the absence of megnetic and electric field ?
I.`n = 1, l = 0, m = 0`
II. `n = 2, l = 0, m = 0`
III.`n = 2, l = 1, m = 1`
IVgt`n = 3, l = 2, m = 1`
V`n = 3, l = 2, m = 0`

A

`(D)` and `(E)`

B

`(C )` and `(D)`

C

`(B)` and `(C )`

D

`(A)` and `(B)`

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The correct Answer is:
A
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In a multi - electron atom , which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields ? (A) n=l, l=0,m=0 (B) n = 2, l =0 , m= 0 (C) n = 2 , l = 1 , m = 1 (D) n = 3, l =2 , m=1 (E) n=3,l=2,m=0.

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