# Electron's speed at any radius ( related to the energy level)

## Description

Electrons in atoms orbit the nucleus. The electrons can only orbit stably, without radiating, in certain orbits (called by Bohr the “stationary orbits”) at a certain discrete set of distances from the nucleus. The electron is held in a circular orbit by electrostatic attraction. The centripetal force is equal to the Coulomb force. The electron’s speed at any radius is depended on the orbit energy level.

Related formulas## Variables

v | Electron's speed (m/s) |

n | The number of energy level (dimensionless) |

h | Planck constant |

m_{e} | electron mass |

r | Orbit radius at any level (m) |