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JEE Main · 2025 · 03 Apr 2025 · Shift 1 · Atomic Structure

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Which of the following postulate of Bohr's model of hydrogen atom in not in agreement with quantum mechanical model of an atom ?
  1. (A)An atom in a stationary state does not emit electromagnetic radiation as long as it stays in the same state
  2. (B)An atom can take only certain distinct energies , etc. These allowed states of constant energy are called the stationary states of atom
  3. (C)When an electron makes a transition from a higher energy stationary state to a lower energy stationary state, then it emits a photon of light
  4. (D)The electron in a H atom's stationary state moves in a circle around the nucleus✓ Correct

Answer: (D)

Solution

In the quantum mechanical model an electron is not confined to a definite path; its location is described by a probability distribution, an orbital, rather than a trajectory. The existence of stationary states, the set of allowed quantised energies and the emission of a photon on a downward transition are all retained by quantum mechanics. The notion that the electron travels in a fixed circular orbit around the nucleus is the postulate that quantum mechanics discards.

JEE Main · 2025 · 03 Apr 2025 · Shift 1 · Single correct option

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