Atomic Theory Scientists

Front

Who proposed the atomic theory that all matter is made up of atoms?

Back

John Dalton

Front

What did Dalton state about atoms of different elements?

Back

Atoms of different elements have different masses.

Front

What did J.J. Thomson discover through his experiments with cathode rays?

Back

He discovered the electron.

Front

What is the main idea of Rutherford's gold foil experiment?

Back

Atoms have a small, dense nucleus that is positively charged.

Front

Who proposed that electrons orbit the nucleus in specific energy levels?

Back

Niels Bohr

Front

What is Dalton's atomic model often referred to as?

Back

The solid sphere model.

Front

What did Bohr's model introduce that was different from previous models?

Back

The concept of quantized energy levels for electrons.

Front

What did Chadwick discover in 1932?

Back

The neutron.

Front

What is the significance of the cathode ray tube in atomic theory?

Back

It led to the discovery of the electron and the understanding of atomic structure.

Front

What is the main limitation of Dalton's atomic theory?

Back

It did not account for isotopes or subatomic particles.