How did Niels Bohr improve on Rutherford’s atomic model?

The Rutherford model proposed by Ernest Rutherford depicted the atom as a miniature solar system with electrons orbiting a dense, positively charged nucleus. However, this model was considered unstable because, according to classical physics, orbiting electrons should continuously emit electromagnetic radiation, lose energy, and spiral into the nucleus.123

Niels Bohr improved upon this by incorporating quantum theory to explain atomic stability. His key modifications included:45

• Stationary States: Bohr postulated that electrons can only occupy a discrete set of stable orbits, or "stationary states," where they do not radiate energy.152
• Quantized Orbits: He restricted allowed orbits to those where the electron's angular momentum is a whole-number multiple of a constant ($\hslash =h/2\pi$).12
• Energy Transitions: Bohr proposed that radiation is emitted or absorbed only when an electron jumps between these fixed orbits, with the energy of the light corresponding to the difference in energy between the two states.52

These changes successfully accounted for the discrete spectral lines observed in hydrogen.456