Question

Which of the following statements does not form a part of Bohr's model of a hydrogen atom?

• A. Energy of the electrons in orbit is quantised
• B. Electrons revolve in different orbits around the nucleus
• C. The electron in orbit nearest to the nucleus has the lowest energy
• D. The electrons position and velocity in orbit cannot be determined simultaneously.

Answer 1

The correct option is D

The electrons position and velocity in orbit cannot be determined simultaneously.

Explanation for the correct options:

(D)The electron's position and velocity in orbit cannot be determined simultaneously.

• According to Bohr, in an atom, an electron is located at a defined distance from the nucleus and it is revolving with a defined velocity around it.
• But according to Heisenberg's uncertainty principle, the position and velocity of the electrons in the orbit cannot be determined simultaneously.

Explanation for the incorrect options:

(A)Energy of the electrons in orbit is quantized.

• It means that the electrons in an atom have only definite values of energies.

(B)Electrons revolve in different orbits around the nucleus.

• Electrons revolve around the nucleus in fixed orbits which are known as energy levels.
• They are represented by K, L, M, and N.

(C)The electron in orbit nearest to the nucleus has the lowest energy.

• The electron in orbit nearest to the nucleus has the lowest energy because it is bound to the nucleus more tightly than any other electron.
• So it takes more energy to release it.

Hence, option (D) is correct., the electron's position and velocity in orbit cannot be determined simultaneously is the statements do not form a part of Bohr's model of a hydrogen atom.