Atomic Model Timeline

This was the first model of the atom ever proposed. It was simple and described atoms as tiny spheres that could not be broken down into smaller pieces.

• Democritus's model of the atom

• The "Plum Pudding Model" of the atom

• The "Rutherford Model" of the atom

• The "Quantum Mechanical Model" of the atom

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

• John Dalton
• Aristotle
• Democritus
• Plato

What contribution did John Dalton make to atomic theory?

• He discovered that every atom was positively charged.

• He discovered that every element consisted of one type of atom.

• He discovered that atoms had nuclei.

• He discovered that atoms could be divided into smaller parts.

Discovered the neutron

• Chadwick
• Rutherford
• Thomson
• Bohr

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Which of the following shows the correct order of Atomic Theory Timeline

• Rutherford, Modern, Dalton, Democritus, Thomson

• Modern, Democritus, Thomson, Rutherford, Dalton

• Dalton, Thomson, Rutherford, Modern, Democritus

• Democritus, Dalton, Thomson, Rutherford, Modern

Rutherford concluded that the atom

• has a nucleus with a positive charge

• has a nucleus with a negative charge

• is a small mass with negative and positive charges

• contains a nucleus without a charge

Which scientist proposed that the atom looked like the above image?

• John Dalton

• JJ Thomson

• Ernest Rutherford

• Niels Bohr

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Who developed the law of conservation of mass?

• Antoine Lavoisier

• Francis Aston

• Michael Faraday

• Joseph Proust

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Whose model suggested that negative particles were mixed in with positively charged material - like seeds in a watermelon?

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

• Albert Einstein

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In the atomic model nicknamed the "plum pudding" model, what do the plums represent?

• the nucleus

• the atom

• the electrons

• the positive material

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