Early Atomic Theory

Idea was of an indivisible particle of matter he called "atomos"

• John Dalton
• Aristotle
• Democritus
• Plato

Discovered the electron using cathode ray tube

• Joseph Thomson
• John Dalton
• Ernest Rutherford
• Robert Millikan

Discovered the neutron

• Ernest Rutherford
• James Chadwick
• Joseph Thomson
• John Dalton

Atomic model was termed the "plum pudding model"

• Joseph Thomson
• Niels Bohr
• Ernest Rutherford

Discovered the proton in 1920

• James Chadwick
• Ernest Rutherford
• John Dalton
• Niels Bohr

Ancient civilizations believed that all matter was made up of 4 basic “elements”, which were defined as:

• air, fire, earth, water

• carbon, hydrogen, oxygen, nitrogen

• hydrogen, oxygen, water, air

• earth, wind, fire, steel

Who was the Greek philosopher who first suggested that matter was composed of indivisible particles which he referred to as atomos?

• Dalton

• Democritus

• Einstein

• Plato

The first universally accepted theory on atoms was proposed in 1803 by what English school teacher?

• Winston Churchill

• John Dalton

• James Bond

• J J Thomson

J.J. Thomson discovered the presence of the first subatomic particle, which was called the:

• atom

• proton

• electron

• nucleus

Through the Gold Foil Experiment, Rutherford showed the existence of what important atomic structure?

• the electron cloud

• the nucleus

• the alpha particle

• the neutron