A helium atom has two electrons and in its ground state both electrons have the

Question

A helium atom has two electrons and in its ground state both electrons have the same energy. Pauli's Exclusion Principle states, however, that both electrons cannot have identical values for all 4 quantum numbers.

One electron has the following quantum numbers:

n=1, l=0, ml=0, ms= +1/2

What are the quantum numbers for the other electron?

n=2, l=1, ml= -1, ms= -1/2

n=1, l=0, ml=0, ms= -1/2

n=2, l=0, ml= -1, ms= +1/2

n=1, l=1, ml=0, ms= +1/2

Which electron configuration is correct?

potassium = [Ar] 4s1

vanadium = [Ar] 3s2 3d3

argon = [Ne] 3s2 2p6

lithium = 1s1 2s1

n=2, l=1, ml= -1, ms= -1/2

n=1, l=0, ml=0, ms= -1/2

n=2, l=0, ml= -1, ms= +1/2

n=1, l=1, ml=0, ms= +1/2

Explanation / Answer

option (B) for 1st question. option (A) for second question.

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