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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

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B

Electrons revolve in different orbits around the nucleus

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C

The electron in orbit nearest to the nucleus has the lowest energy

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D

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

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Solution

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.


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