The History of the Atom

What Greek philosopher first spoke about the idea of an atom?

• Democritus

• Dalton

• Thomson

• Rutherford

The word “atom” comes from the Greek “atomos."  What does "atomos" translate to?

• Important
• Atmosphere
• Indivisible
• Cuttable

Which is the correct sequence of the scientists who made major changes in the model of the atom?

1-JJ Thomson

2- James Chadwick

3-John Dalton

4-Niels Bohr

5-Ernest Rutherford

• 2, 1, 4, 3, 5

• 3, 1, 5, 4, 2

• 5, 3, 2, 1, 4

• 4, 3, 2, 1, 5

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. 

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

• J.J. Thomson

• Ernest Rutherford

• John Dalton

• Democritus

Which scientist discovered the electron?

• Bohr
• Rutherford
• Dalton
• Thomson

Which scientist discovered the nucleus?

• Bohr
• Rutherford
• Chadwick
• Thomson

Who is the scientist who proposed the "solar system" model of an atom where the electrons orbit around the nucleus?

• Democritus
• Niels Bohr
• Ernest Rutherford
• Chadwick

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What scientist discovered the neutron?

• Chadwick

• Schrodinger

• Thomson

• Rutherford

This model of the atom described atoms as tiny spheres that could not be broken down into smaller pieces.

• Dalton's model of the atom
• The "Plum Pudding Model" of the atom
• The Nuclear Model
• The Bohr Model

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NGSS.MS-PS1-1