Which statement describes a major drawback of the bohr model that caused scientists to replace it?

a) it worked only for helium and larger atoms.
b) it did not identify the distance between an electron and the nucleus.
c) it contradicted the heisenberg uncertainty principle.
d) it stated that spectral lines of atoms are similar.

It contradicted the Heisenberg uncertainty principle.

Explanation:

Bohr's theory is as follows :

(1) The electron revolves in a circular orbit i.e. the centripetal force is balanced by the electrostatic force.

(2) The electron moves in selected orbits. The energy levels of electrons are classified in terms of K, L, M and N. K is the lowest energy level and is called the ground state and the highest energy level is called the excited state.

(3)  Bohr's theory contradicts the Heisenberg uncertainty principle. According to this principle, it is not possible to find the position and the velocity of an electron simultaneously.

(4) But according to Bohr's theory, the position and the velocity of an electron can be easily determined.

Hence, the correct option is (c) " It contradicted the Heisenberg uncertainty principle ".

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360seconds i 1 hr