Question 1
The number of states in the He+ ion corresponding to the principle quantum number n = 5 are
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18
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25
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50
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9
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11
Question 2
The Pauli Exclusion Principle states
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no two electrons in the same atom can have the same set of quantum numbers.
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there is an inherent uncertainty in the position and momentum of a particle.
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when an atom has orbitals of equal energy, the maximum number of electrons will have unpaired spins.
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when an atom has orbitals of equal energy, the maximum number of electrons will be paired spins.
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no two atoms can have the same set of quantum numbers.