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The following quantum numbers are possible for how many orbital n=3,ℓ=2,m=+2?
 A 1 B 2 C 3 D 4

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Correct option is A)
n=3,l=2,m=+2 represents one of the 3d orbital with magnetic quantum number +2.

No two orbitals have the same magnetic quantum number. Hence given quantum number is possible for only one orbital and 2 electrons.
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