Bohr radius (first orbit scale) (a0 ≈ 52.9 pm (0.529 Å))
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a0 ≈ 52.9 pm (0.529 Å)
What each symbol means
| Symbol | What it stands for |
|---|---|
| e | Elementary charge |
| a_0 | Bohr radius — radius of first Bohr orbit for hydrogen (m or pm) |
| m_e | Electron mass |
| \hbar | Reduced Planck constant |
| \varepsilon_0 | Vacuum permittivity |
When to use this
Defines the natural length scale for hydrogenic atoms in the Bohr model; numerical value is for infinite nuclear mass approximation.