The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a₀ = 0.529 × 10−¹⁰ m. The electric potential created by the proton at the position of the electron is

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The electric potential V at a distance r from a point charge Q is given by V = kQ/r, where k is Coulomb's constant. For a proton, Q = +e, and at distance a₀, V = (8.99 × 10⁹ Nm²/C²)(1.6 × 10⁻¹⁹ C)/(0.529 × 10⁻¹⁰ m) = +27.2 V.

The Bohr Model Pictures a Hydrogen Atom in Its Ground