Question

atomic structure unit test
which incorrect aspect of rutherfords model was fixed by bohr’s model? (1 point)
○ atoms have small, dense, positively charged nuclei.
○ positively charged nuclei repel positively charged alpha particles.
○ electrons move freely in curved paths around the nucleus.
○ the nucleus contains most of the mass of an atom.

Explanation:

1. Recall Rutherford's and Bohr's atomic models:

• Rutherford's model proposed that electrons move freely in curved (random) paths around the nucleus. But this was a problem because according to classical physics, such electrons would radiate energy and collapse into the nucleus.
• Bohr's model fixed this by proposing that electrons move in specific, quantized energy levels (orbits) around the nucleus, not freely in curved paths.
• The other options: "Atoms have small, dense, positively charged nuclei" and "The nucleus contains most of the mass of an atom" were correct aspects of Rutherford's model (not incorrect, so not fixed by Bohr). "Positively charged nuclei repel positively charged alpha particles" is related to Rutherford's gold foil experiment and was a correct observation, not an incorrect aspect fixed by Bohr.

Answer:

C. Electrons move freely in curved paths around the nucleus.