Question
Which of the following statements do not form a part of Bohr’s model of hydrogen atom?
A.
Energy of the electrons in the orbits are quantised
B.
The electron in the orbit nearest the nucleus has the lowest energy
C.
Electrons revolve in different orbits around the nucleus
D.
The position and velocity of electrons in the orbit cannot be determined simultaneously
Answer :
The position and velocity of electrons in the orbit cannot be determined simultaneously
Solution :
The main postulates of Bohr model of atom are
(i) The electrons in an atom revolve around the nucleus only in certain selected circular paths, called orbits.
(ii) The energy is emitted or absorbed only when the electrons jump from one energy level to another.
(iii) Only those orbits are permitted in which the angular momentum of the electron is a whole number multiple of $$\frac{h}{{2\pi }}$$ ( where, $$h$$ is Planck's constant ) that's why only certain fixed orbits are allowed, i.e. the momentum of an electron is quantised.