Front

Who discovered that atoms are indivisible?

Back

Dalton

Front

Who discovered the nucleus?

Back

Rutherford

Front

In which year did Bohr make his significant contributions to atomic theory?

Back

1913

Front

Who discovered that electrons travel in definite paths?

Back

Bohr

Front

In which year did Dalton make his significant contributions to atomic theory?

Back

1803

Front

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

Back

All matter is made of atoms, which are indivisible and indestructible.

Front

What did Rutherford's gold foil experiment demonstrate?

Back

The existence of a small, dense nucleus at the center of the atom.

Front

What is Thomson known for discovering?

Back

The electron, using the cathode ray tube experiment.

Front

What model of the atom did Bohr propose?

Back

The planetary model, where electrons orbit the nucleus in fixed paths.

Front

What did Democritus contribute to atomic theory?

Back

The idea that everything is made of tiny, indivisible particles called atoms.