Bohr's model of the hydrogen atom postulates that the angular momentum of an electron in an allowed orbit is
A{'text': 'Continuous', 'label': 'A'}
B{'text': 'Directly proportional to r', 'label': 'B'}
C{'text': 'Quantised in units of h/(2π)', 'label': 'C'}
D{'text': 'Inversely proportional to n²', 'label': 'D'}
Answer & Solution
Correct answer: C. {'text': 'Quantised in units of h/(2π)', 'label': 'C'}
1. Bohr proposed that the angular momentum m v r of an orbiting electron is quantised.
2. Specifically, m v r = n × h / (2π), where n = 1, 2, 3, … is the principal quantum number.
3. Only orbits satisfying this condition are stable.
4. This quantisation eliminates the classical instability problem.
_Source: NCERT Class 11 Chemistry, Ch 2 "Structure of Atom", §2.4_
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