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Question: Answered & Verified by Expert
The set of principal (n), azimuthal $(\ell)$ and magnetic $\left(\mathrm{m}_{1}\right)$ quantum numbers that is not allowed for the electron in $\mathrm{H}$-atom is
ChemistryStructure of AtomKVPYKVPY 2011 (SA)
Options:
  • A $\mathrm{n}=3, \ell=1, \mathrm{~m}_{1}=-1$
  • B $\mathrm{n}=3, \ell=0, \mathrm{~m}_{1}=0$
  • C $\mathrm{n}=2, \ell=1, \mathrm{~m}_{1}=0$
  • D $\mathrm{n}=2, \ell=2, \mathrm{~m}_{1}=-1$
Solution:
2268 Upvotes Verified Answer
The correct answer is: $\mathrm{n}=2, \ell=2, \mathrm{~m}_{1}=-1$
$n$ is always greater than $\ell$
and $\mathrm{m}=-\ell \ldots \ldots .0 \ldots \ldots .+\ell$
If $n=2$, then $\ell=0,1$
and $\mathrm{m}_{\ell}=0,\{-1,0,+1\}$

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