Question

How many quantum numbers are used to describe an electron?

Answer 1

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Four quantum numbers: L, N, M, S.

L, is the principal quantum number, an integer from 1 to N that describes its energy level;

N, is the subsidiary quantum number, between 0 and N-1, describing the number and type of orbitals;

M, is the magnetic quantum number, describing the orientation of orbitals;

S, is the spin, either up or down.

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Answer 2

S is the principal quantum number, an integer from 1 to S that describes its energy level.

P is the subsidiary quantum number, between 0 and P-1, describing the number and type of orbitals.

D is the magnetic quantum number, describing the orientation of orbitals.

F is the spin, either up or down.