For the quantum numbers n = 2, ℓ = 1, mℓ = 1, there can be a maximum of two electrons.
The term quantum numbers refer to the numbers that describe the position of electron in an atom.
There are four sets of quantum numbers which are;
For the quantum numbers n = 2, ℓ = 1, mℓ = 1, there can be a maximum of two electrons.
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