| Symbol | a0 or rBohr |
|---|---|
| Named after | Niels Bohr |
| Approximate values (to three significant digits) | |
| SI units | 5.29×10−11 m (52.9 pm) |
The Bohr radius () is a physical constant, approximately equal to the most probable distance between the nucleus and the electron in a hydrogen atom in its ground state. It is named after Niels Bohr, due to its role in the Bohr model of an atom. Its value is 5.29177210544(82)×10−11 m.[1][2]
- ^ "2022 CODATA Value: Bohr radius". The NIST Reference on Constants, Units, and Uncertainty. NIST. May 2024. Retrieved 2024-05-18.
- ^ The number in parentheses denotes the uncertainty of the last digits.