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# Azimuthal Quantum Number

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 Sub Topics An atom consists of different types of orbits. These orbitals are formed according to the quantum numbers. Three important types of quantum numbers named principal, azimuthal and magnetic quantum numbers are responsible for the shape, orientation and energy of orbitals. In order to describe an electron, another quantum number is required, which is termed as spin quantum number. This will helps to explain the spin of an electron.

## Definition

Sommerfield proposed the azimuthal quantum number. Angular momentum of an electron can determined by this quantum number using the given formula,
Angular momentum = $\sqrt{l(l+1)}$$\times$$\frac{h}{2\pi}$
The values of the azimuthal quantum number ranges 0 to (n-1), where n is the principal quantum number.