History of the Atom

Front

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

Back

J.J. Thomson provided evidence that an atom contains negatively charged particles, known as electrons.

Front

What did Rutherford's experiments reveal about the atom?

Back

Rutherford's experiments showed that the atom has a nucleus, which is a dense central core.

Front

Who is known for the Gold Foil Experiment?

Back

Ernest Rutherford is known for performing the Gold Foil Experiment.

Front

What is the main feature of Bohr's atomic model?

Back

Bohr's atomic model describes electrons as being located in circular orbits around the nucleus.

Front

What are the negatively charged particles in an atom called?

Back

Electrons are the negatively charged particles in an atom.

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons.

Front

Who proposed the first modern atomic theory?

Back

John Dalton proposed the first modern atomic theory.

Front

What did Democritus contribute to atomic theory?

Back

Democritus is known for proposing that matter is made up of small, indivisible particles called atoms.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge; it is neutral.