Question

Which of the following is not a postulate of Bohr's atomic model?

• A. The electrons revolve around the nucleus in certain fixed orbits called shells.
• B. While revolving around nucleus in an orbit, an electron does not gain energy.
• C. While revolving around nucleus in an orbit, electron always lose energy.
• D. On gaining certain amount of energy, electron jumps to the next higher energy level.

Answer 1

The correct option is C While revolving around nucleus in an orbit, electron always lose energy.

The postulates of Bohr’s atomic model are as follows:

• The electrons revolve rapidly around the nucleus in fixed circular paths called energy levels or shells.
• Each energy level (or shell) is associated with a fixed amount of energy.
• There is no change in the energy of electrons as long as they keep revolving in the same energy level, and the atom remains stable.
• The electron will move from a lower stationary state to a higher stationary state when the required amount of energy is absorbed by the electron or energy is emitted when the electron moves from higher stationary state to lower stationary state. Hence, the correct answer is option (c).