# How did Niels Bohr arrive at the second postulate of his atomic model?

Niels Bohr's second postulate of the Atomic Model states that the electron revolves in specific orbits in which the electron's angular momentum is an integral multiple of $$\large\frac{h}{2π}$$. Since De Broglie later explained it, how did Bohr arrive at it earlier?

• Regarding the quantization of angular momentum, Bohr, in his 1913 paper describing his model of the atom, was quoting John Nicholson. "Nicholson is noted as the first to create an atomic model that quantized angular momentum as $\frac{h}{2\pi}$. Nicholson was also the first to create a nuclear and quantum theory that explains spectral line radiation as electrons descend toward the nucleus. Niels Bohr quoted him in his 1913 paper of the Bohr model of the atom."
– nwr
May 17, 2022 at 17:46