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In a multi-electron atom, which of the f...

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=1, 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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The electron having same principle quantum number and azimuthal quantum number will bw the same energy in absence of magnetic and electric field.
(iv) `n=3, l=2, m=1 (v) n=3, l=2, m=0` have same `n` and `l` value.
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