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Question

The main defect of Bohr's atom model is :
  1. mixing of classical and quantum theories
  2. exclusion of nuclear motion
  3. failed to explain the fine structure of spectral lines
  4. failed to explain larger atoms

A
failed to explain larger atoms
B
mixing of classical and quantum theories
C
exclusion of nuclear motion
D
failed to explain the fine structure of spectral lines
Solution
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Bohr's model can only clearly explain hydrogen or hydrogen-like atoms, it fails when applied to larger and heavier atoms like iron, gold, mercury, etc.

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