Question

which experiment led to the idea that atoms have small negatively charged subatomic particles?
rutherfords gold foil experiment
bohrs light emission experiments
daltons gas experiments
thomsons cathode ray experiments

Explanation:

• Rutherford's gold foil experiment discovered the atomic nucleus.
• Bohr's experiments focused on atomic energy levels.
• Dalton's experiments established atomic theory but not subatomic particles.
• Thomson's cathode ray experiments identified negatively charged particles (electrons) by observing ray deflection in electric/magnetic fields, proving atoms contain small negative subatomic particles.

Answer:

D. Thomson's cathode ray experiments