Ncert Exercises & Solutions

The simple Bohr model is not applicable to \(\text{He}^4\) atom because:

(a)	\(\text{He}^4\) is an inert gas.
(b)	\(\text{He}^4\) has neutrons in the nucleus.
(c)	\(\text{He}^4\) has one more electron.
(d)	electrons are not subject to central forces.

Choose the correct option:

1.	(a), (c)	2.	(a), (c), (d)
3.	(b), (d)	4.	(c), (d)

Hint: The Bohr model is only applicable to the H-like atoms.

Explanation: The simple Bohr model is not applicable to the \(\text{He}^4\) atom because \(\text{He}^4\) has one more electron and electrons are not subject to central forces. Bohr proposed a model for the hydrogen atoms which is also applicable for some lighter atoms in which a single electron revolves around a stationary nucleus of positive charge \(Ze\) (called hydrogen-like atom). It is valid only for one-electron atoms, e.g. : \(\mathrm H, \mathrm{He}^{+}, \mathrm{Li}^{+2}, \mathrm{Na}^{+1}\) etc.
The Bohr model is not applicable to \(\mathrm{He}^4,\) as it has one more electron and electrons are not subject to central forces.
Hence, option (4) is the correct answer.

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions