Ncert Exercises & Solutions

The simple Bohr model is not applicable to He⁴ atom because

(a) He⁴ is an inert gas
(b) He⁴ has neutrons in the nucleus
(c) He⁴ has one more electron
(d) electrons are not subject to central forces

1. (a, c)

2. (a, c, d)

3. (b, d)

4. (c, d)

(4) Hint: The Bohr model is only applicable to the Hilike atoms.

The simple Bohr model is not applicable to He⁴ atom because He⁴ has one more electron and electrons are not subject to central forces.