History of the Atomic Model

Front

What is the atomic model proposed by Democritus?

Back

Democritus proposed that matter is made up of indivisible particles called 'atomos', which means 'indivisible' in Greek.

Front

Who discovered the neutron?

Back

James Chadwick discovered the neutron in 1932.

Front

What did Ernest Rutherford's gold foil experiment reveal about the atom?

Back

Rutherford's experiment revealed that the atom is mostly empty space and has a small, positively charged nucleus.

Front

What is the main idea of the Quantum Mechanical Model of the atom?

Back

The Quantum Mechanical Model describes electrons as existing in probabilistic clouds around the nucleus, rather than in fixed orbits.

Front

What did Niels Bohr contribute to the atomic model?

Back

Niels Bohr proposed that electrons move in specific orbits around the nucleus, with each orbit corresponding to a specific energy level.

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 significance of the Plum Pudding Model?

Back

The Plum Pudding Model, proposed by J.J. Thomson, suggested that atoms are composed of a positively charged 'soup' with negatively charged electrons scattered throughout.

Front

What did the discovery of the nucleus change about the atomic model?

Back

The discovery of the nucleus led to the understanding that most of the atom's mass is concentrated in a small, dense center, changing the view of atomic structure.

Front

What is the role of neutrons in the atom?

Back

Neutrons contribute to the mass of the atom and help stabilize the nucleus by offsetting the repulsive forces between protons.