Atomic Theory

Front

Who proposed that the atom is a solid sphere?

Back

Democritus and Dalton

Front

What did Democritus believe about atoms?

Back

He believed that atoms are small, hard particles that are indivisible.

Front

What did Ernst Rutherford discover using the gold foil experiment?

Back

He discovered the proton.

Front

Which atomic model is most similar to the solar system?

Back

Bohr's model.

Front

Who was the first to publish a theory about the existence of atoms?

Back

John Dalton.

Front

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

Back

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

Front

What did J.J. Thomson discover about the atom?

Back

He discovered the electron and proposed the 'plum pudding' model.

Front

What is the significance of the gold foil experiment?

Back

It led to the discovery of the atomic nucleus.

Front

What did Rutherford conclude about the structure of the atom?

Back

Most of the atom is empty space, with a dense nucleus at the center.

Front

What is the charge of a proton?

Back

Positive.