9
QuizMultiple Choice

The Modern Atomic Theory

Question 9 • *26-27 CFISD TX-Chemistry A CR

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

Answer
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.

Explanation

The Bohr model pictured electrons moving in fixed orbits with definite positions and paths. The Heisenberg uncertainty principle says an electron’s position and momentum cannot both be known precisely, so this feature of the model was a major drawback. Choice C correctly identifies the contradiction.

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