The History of the Atom

Front

Who discovered the nucleus of the atom?

Back

Rutherford

Front

Who discovered the electron?

Back

Thomson

Front

Which Greek philosopher first proposed the idea of an atom?

Back

Democritus

Front

What charge does the nucleus of an atom have?

Back

Positively charged

Front

What does Dalton's model of the atom describe?

Back

Atoms as tiny spheres that cannot be broken down into smaller pieces.

Front

What is the 'Plum Pudding Model' of the atom?

Back

A model that describes the atom as a sphere of positive charge with negatively charged electrons embedded within it.

Front

What did Rutherford's gold foil experiment demonstrate?

Back

That atoms have a small, dense nucleus at their center.

Front

What is the main idea of the Bohr model of the atom?

Back

Electrons orbit the nucleus in specific energy levels.

Front

Who proposed the atomic theory that matter is made up of indivisible particles?

Back

Dalton

Front

What is the significance of Chadwick's discovery?

Back

He discovered the neutron, which is a particle in the nucleus of the atom.