Question

what are quantum numbers

Answer 1

A quantum number is a value that is used when describing the energy levels available to atoms and
molecules. An electron in an atom or ion has four
quantum numbers to describe its state and yield solutions to the Schrödinger wave equation for the hydrogen atom.
There are four quantum numbers:

n - principal quantum number - describes the energy level
ℓ - azimuthal or angular momentum quantum number - describes the subshell
mℓ or m - magnetic quantum number - describes the orbital of the subshell
ms or s - spin quantum number - describes the spin.

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Answer 2

Quantum numbers are those numbers that occur in the theoretical expressions in place of the values of some quantized properties of some subatomic particles, atom or a molecule. There are a total of 4 quantum numbers. They are represented by integral or half integral values.