The History of Atomic Structure

Who believed that electrons were scattered amongst positively charged material.

• JJ Thomson
• Ernest Rutherford
• John Dalton
• Niels Bohr

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Believed that atoms are small, hard particles that were "indivisible"

• Democritus
• Aristotle
• Schrodinger
• Greek Philosophers

Discovered that the atom has a small, dense, positively charged nucleus.

• Ernest Rutherford
• Heisenberg
• Democritus
• JJ Thomson

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Believed that electrons traveled around the nucleus in definite paths.

• Niels Bohr
• John Dalton
• Modern Atomic Theory
• Ernest Rutherford

Determined that electron paths cannot be predicted and exist inside the Electron Cloud.

• Schrodinger & Heisenberg
• Ernest Rutherford
• John Dalton
• Democritus

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Believed that all atoms of the same element would be the same.

• John Dalton
• JJ Thomson
• Niels Bohr
• Modern Atomic Theory

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NGSS.MS-PS1-1

The following picture represents which atomic model?

• Plum Pudding

• Electron Cloud

• Planetary

• Billiard Ball

The smallest unit of matter is called?

• An electron
• An element
• An atom
• A solid

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NGSS.MS-PS1-1

This model this model was the first to show a nucleus, consisting of protons and neutron.  Electrons surround the nucleus but are not shown in distinct energy levels. 

• The "Rutherford Model" of the atom
• The "Plum Pudding Model" of the atom
• The "Quantum Mechanical Modell" of the atom
• Democritus's model of the atom

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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

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NGSS.MS-PS1-1