Question

Which statements concerning Bohr‘s model are true?

(a) Predicts that probability of electron near nucleus is more

(b) Angular momentum of electron in H-atom = \(\frac{nh}{2π }\)

(c) Introduces the idea of stationary states

(d) Explains line spectrum of hydrogen

Answer 1

Correct options are (b), (c) and (d)

The important postulates of Bohr's theory are:

1. In an atom, the electrons revolve around the nucleus in certain definite circular paths called orbits, or shells.

2. As long as it remains in that orbit, it neither emits nor absorbs energy. These are termed stationary states or main energy states

3. Bohr proposed that the angular momentum of an electron is quantized. Thus, the motion of an electron is restricted to those orbits where its angular momentum is an integral multiple of \(\frac h{2\pi}\)​, where h is Planck's constant.

4. The electrons present in an atom can move from a lower energy level (lower) to a level of higher energy (higher) by absorbing the appropriate energy. Similarly, an electron can jump from a higher energy level (higher) to a lower energy level (lower) by losing the appropriate energy.

The energy absorbed or lost is equal to the difference between the energies of the two energy levels, i.e.,

E = E_higher ​− E_lower​

Bohr's atomic model does not predict the probability of electron near the nucleus.