Question

Describe Bohr’s model of the atom.

Answer 1

A Danish physicist, Neils Bohr, offered the following postulates for modifying the Rutherford model.

1. Atoms have a core nucleus surrounded by electrons.
2. An atom comprises a small, positively charged nucleus at the centre, around which electrons travel in circular paths known as orbits or shells.
3. Each orbit has a defined amount of energy; hence, they are known as energy levels or energy shells.
4. The energy shells' order will be
   K < L < M < N < O < .........
   or, 1 < 2 < 3 < 4 < 5 < .........
5. An electron does not lose or gain energy while remaining in a specific orbit.
6. When an electron moves in an orbit, it absorbs and emits no energy. However, energy is absorbed when it moves from a lower to a higher orbit, and energy is emitted when it moves from a higher to a lower orbit.