Question

match
conducted the gold foil experiment, which revealed the existence of the atomic nucleus and disproved the plum pudding model.
proposed the atomic theory in the early 19th century, which formed the foundation of modern atomic theory.
discovered the neutron in 1932 through his experiments with atomic nuclei.
proposed to the cloud model, electrons are spread throughout the entire atom, rather than orbiting in fixed paths.
proposed the planetary model of the atom, where electrons orbit around a central nucleus in specific energy levels.
discovered the electron through his experiments with cathode rays, leading to the development of the plum pudding model of the atom.

Explanation:

1. Ernest Rutherford conducted the gold - foil experiment.
2. John Dalton proposed the atomic theory in the early 19th century.
3. James Chadwick discovered the neutron in 1932.
4. Erwin Schrödinger proposed the cloud model.
5. Niels Bohr proposed the planetary model of the atom.
6. J. J. Thomson discovered the electron and led to the plum - pudding model.

Answer:

1. Ernest Rutherford
2. John Dalton
3. James Chadwick
4. Erwin Schrödinger
5. Niels Bohr
6. J. J. Thomson