Atomic Theory Scientists

Front

What is the nucleus of an atom?

Back

The nucleus is the dense, positively charged center of an atom, containing protons and neutrons.

Front

Who discovered the electron?

Back

J.J. Thomson discovered the electron in 1897.

Front

What is the Billiard Ball theory?

Back

The Billiard Ball theory, proposed by John Dalton, describes atoms as solid, indivisible spheres.

Front

What does the Plum Pudding model represent?

Back

The Plum Pudding model, proposed by J.J. Thomson, depicts the atom as a sphere of positive charge with negatively charged electrons embedded within it.

Front

Who proposed the concept of 'atomos'?

Back

Democritus, a Greek philosopher, proposed the concept of 'atomos', meaning indivisible.

Front

What did Ernest Rutherford discover?

Back

Ernest Rutherford discovered the nucleus of the atom through his gold foil experiment.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the mass of a neutron compared to a proton?

Back

A neutron has a mass similar to that of a proton, but it is neutral (no charge).

Front

What did Niels Bohr contribute to atomic theory?

Back

Niels Bohr proposed the Bohr model, which describes electrons orbiting the nucleus at fixed distances.