**7.PS1.1--ATOMIC HISTORY

7.PS1.1
Develop and use models to illustrate the structure of atoms, including the subatomic particles with their relative positions and charge

I can use historical models of the Atom to explain how the protons, neutrons, and electrons behave in reference to their charges and attractions.

Models are used in science as a way to represent what we cannot see. They help us

work with, visualize, and understand scientific concepts. However, models are constantly changing as we develop new technology and continue to make advancements. We are going to study the atom in this unit, and it is important to learn about the process of developing our most current model.

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​History of the Model of the Atom:

• ​Things we still believe from Dalton:
  Dalton believed that elements would each have their own type of atoms that were exactly alike.

• He thought they were round balls that could not break down any smaller.

• Dalton believed that atoms were not able to be destroyed.

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Electrons could not be seen when they were discovered. How could Thompson know they were there?

On the next slide you will go to an exploration website to try a simulation of the Cathode Ray Tube. This tube was used in the early television sets. This tube helped Thompson understand the movement he saw in his cathode ray tube.

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Multiple Choice

What subatomic particle was discovered by J.J. Thompson's experiments with the Cathode Ray Tube?

• proton
• neutron
• electron
• photon

Open Ended

Describe what Thompson observed

that made him aware there were

particles that attracted each other in his experiment.

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Multiple Choice

Rutherford's Gold foil experiment led him to discover ___________

• plum pudding

• the nucleus

• the electron cloud

• the atomic cloud

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discovered many laws we still use today in chemistry. He also thought the atom was a solid sphere or round ball model.

Open Ended

How did the discoveries of J.J. Thomson and Ernest Rutherford contribute to the development of our current understanding of the atom?

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thought plum pudding was a good model for his version of the atom.The plums were electrons inside pudding that represented the positively charged particles.

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A solar system model of the atom was proposed by​ ​

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, It has electrons in levels or shells around the nucleus. We still use it today as a simplified version.

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Something hard and dense in the center caused electrons to "bounce" off of the atom. He used Gold foil in his experiment. This scientist was ​

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Something hard and dense in the center caused electrons to "bounce" off of the atom. He used Gold foil in his experiment. This scientist was ​

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