Atomic Theory

GUIDING QUESTIONS

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Unit 1: Atoms & The Periodic Table

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• What are the parts that make up an atom?

• What is Atomic Theory?

• What evidence supports the modern model of the atom?

8th Grade Science

Lesson 1: Atomic Theory

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Atomic Theory

The story of the birth and development of Chemistry

PART 1: 430 BCE - 1900

Atomic Theory

The story of the birth and development of Chemistry

PART 2: 1900 - present

Poll

Of the following, which scientist/discovery did you find most interesting?

• Bohr's orbital model of the atom; specific energy levels for electrons

• Thomson's Chocolate Chip Cookie model of the atom; discovery of electrons

• Dalton and the very fist Atomic Theory

• Rutherford and his discovery of the positively-charged nucleus and the proton

Summary of Contributions

​John Dalton

​​J.J. Thomson​

​Ernest Rutherford

​Neils Bohr

​​first atomic theory

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Inferred all atoms have the same four characteristics​

discovered the electron

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"Chocolate Chip Cookie" Model

discovered the positive charge of the nucleus + the proton

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Gold Foil Experiment

theorized about electron orbitals around the nucleus

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Orbital Model​

​(1600 - present time)

Reorder

Reorder the following

• Democritus

• Dalton

• Thomson

• Rutherford

• Bohr

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Draw

To the best of your ability, draw Thomson's model of the atom

Draw

To the best of your ability, draw Dalton's model of the atom

Draw

To the best of your ability, draw Rutherford's model of the atom

Draw

To the best of your ability, draw Bohr's model of the atom

Video Response

In your own words, describe the 4 main parts of Dalton's Atomic Theory:

Open Video Recorder

Video Response

In the story of the origin and development of modern atomic theory, what was the most memorable or interesting part for you? Why?

Open Video Recorder

Open Ended

What questions do you have?