# Formula Bohr Model Circumference    Principal quantum number    De Broglie wavelength

## Circumference

Unit
The quantized circumference of the orbit of an electron in the $$\class{red}{n}$$-th state in the framework of the Bohr model.

## Principal quantum number

Unit
The principal quantum number $$\class{red}{n} = 1, 2, 3, ...$$ numbers the discrete energy states of an electron in the atom.

## De Broglie wavelength

Unit
The de Broglie wavelength of an electron in the $$\class{red}{n}$$-th state.