Early Atomic Theories

The earliest ideas of atoms are attributed to this philosopher.

• Aristotle

• Democritus

• Atomos

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What is the correct order of scientists in order of their work related to the atomic theory from earliest to most recent?

• Ernest Rutherford, JJ Thomson, John Dalton, & Democritus

• JJ Thomson, John Dalton, Ernest Rutherford, & Democritus

• Democritus, John Dalton, JJ Thomson, Ernest Rutherford.

• John Dalton, JJ Thomson, Democritus, & Ernest Rutherford

Aristotle originally believed everything was made up of how many elements? Type the number.

The first universally accepted theory on atoms was proposed in 1803 by:

• Winston Churchill

• John Dalton

• James Bond

• J J Thomson

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Tomson
• Ernest Rutherford
• John Dalton
• Democritus

Rutherford discovered this part of the atom:

• Nucleus

• Neutron

• Proton

• Electron

Which conclusion could be made from Ernest Rutherford’s gold foil experiment?

• Atoms are made up of mostly empty space.

• Atoms are mainly solid and block alpha particles.

• The volume of the nucleus is large compared to the rest of the atom.

• The mass of the nucleus is small compared to the rest of the atom.

What did Ernest Rutherford’s gold foil experiment demonstrate about atoms?

• Their positive charge is located in a small region that is called the nucleus.

• Their negative charge is located in small particles that are called electrons.

• Their nucleus makes up the majority of the volume of the atom.

• Their electrons are floating in a sea of positive charges.

Which one of these is Dalton's Model?

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Why did Ernest Rutherford and his colleagues perform the Gold-Foil Experiment?

• They wanted to test and confirm the Plum-Pudding model

• They wanted to test John Dalton's Model

• They were looking for electrons

• They wanted to come up with their own Atomic Model