How many quantum numbers are used to describe an electron?

Answer 1

L, N, M, and S are the four quantum numbers.

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

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Answer 2

Sebastian Acosta

Four quantum numbers are used to describe an electron:

Principal Quantum Number ((n))
Azimuthal Quantum Number ((l))
Magnetic Quantum Number ((m_l))
Spin Quantum Number ((m_s))

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.