How did niels bohr make his discovery?

Answer 1

He formulated his atomic model (electrons orbiting the nucleus) in 1913.

Answer 2

Niels Bohr made his discovery by proposing a new model of the atom, known as the Bohr model, which incorporated the concept of quantized energy levels. He based his model on experimental evidence, particularly the analysis of the emission spectra of hydrogen gas, and it successfully explained the stability of atoms and the quantization of energy levels within them.