Question

which experiment led to the idea that electrons can exist only at specific distances from the nucleus?
thomsons cathode ray experiments
bohrs light emission experiments
rutherfords gold foil experiment
daltons gas experiments

Explanation:

• Thomson's cathode ray experiments discovered electrons, not their specific orbital distances.
• Bohr's light emission experiments studied the discrete spectral lines of hydrogen, which led to the model where electrons occupy fixed, specific energy levels (distances from the nucleus).
• Rutherford's gold foil experiment established the nuclear structure of the atom, not electron energy levels.
• Dalton's gas experiments formed the basis of atomic theory but did not address electron positions.

Answer:

B. Bohr's light emission experiments