The Development of Atomic Theory

Front

What is the main idea of Atomic Theory?

Back

Atomic Theory states that matter is composed of discrete units called atoms, which are the fundamental building blocks of all substances.

Front

Who proposed the first modern atomic theory?

Back

John Dalton proposed the first modern atomic theory in the early 19th century.

Front

What are the three main subatomic particles?

Back

The three main subatomic particles are protons, neutrons, and electrons.

Front

What charge do protons carry?

Back

Protons carry a positive charge.

Front

What charge do electrons carry?

Back

Electrons carry a negative charge.

Front

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

Back

A neutron has a mass approximately equal to that of a proton, but it is neutral.

Front

What did J.J. Thomson discover?

Back

J.J. Thomson discovered the electron through his cathode-ray tube experiment.

Front

What is the significance of the Gold-Foil Experiment?

Back

The Gold-Foil Experiment, conducted by Ernest Rutherford, demonstrated that atoms have a small, dense nucleus.

Front

What does the term 'nucleus' refer to in atomic structure?

Back

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

Front

What does 'atomos' mean in Greek?

Back

'Atomos' means 'unable to be cut or divided'.