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There are four quantum numbers (n , l , ml , ms ).
No two electrons in the same atom can have the same four quantum
numbers. Each quantum number describes a different aspect of the electron and its orbital. These numbers are obtained from the solution of the Schrödinger Equation for atoms in spherical coordinates.

### n, the principle quantum number

**n**### l, azimuthal quantum number

lt tells you about the angular momentum
of the electron in the orbital. It defines the shape of the orbital.
lt can be any integer between (and including) 0 and (n−1 ). Each orbital has l planar nodes.

Some examples of orbitals with differentl :

Some examples of orbitals with different