What was Niels Bohr contribution to the atom?

Answer 1

• The Bohr model of the atom, the theory that electrons travel in discrete orbits around the atom's nucleus.
• The shell model of the atom, where the chemical properties of an element are determined by the electrons in the outermost orbit.
• The liquid drop model of the atomic nucleus.
• Identified the isotope of uranium that was responsible for slow-neutron fission

This answers came from wikipedia

Answer 2

Niels Bohr introduced the concept of quantized electron orbits in the atom, known as the Bohr model, which explained the stability of atoms. He also proposed that electrons absorb and emit energy in discrete quanta when they jump between different energy levels, which laid the groundwork for understanding atomic structure.