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Atoms and their structure
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16 to 8 is a 2 to 1 ratio.

True because you have to add a whole atom, you canít add a piece of an atom.

Slide 11

Parts of Atoms

Parts of Atoms

J. J. Thomson - English physicist. 1897

Made a piece of equipment called a cathode ray tube.

It is a vacuum tube - all the air has been pumped out.

A limited amount of other gases are put in

Slide 12

Thomsonís Experiment

Thomsonís Experiment

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Metal Disks

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Passing an electric current makes a beam appear to move from the negative to the positive end

Passing an electric current makes a beam appear to move from the negative to the positive end

Thomsonís Experiment

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Slide 14

Thomsonís Experiment

Thomsonís Experiment

By adding an electric field

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Slide 15

Thomsonís Experiment

Thomsonís Experiment

By adding an electric field he found that the moving pieces were negative

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By adding an electric field

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Thomsonís Experiment

Thomsonís Experiment

Used many different metals and gases

Beam was always the same

By the amount it bent he could find the ratio of charge to mass

Was the same with every material

Same type of piece in every kind of atom

Slide 17

Thomsomís Model

Thomsomís Model

Found the electron.

Couldnít find positive (for a while).

Said the atom was like plum pudding.

A bunch of positive stuff, with the electrons able to be removed.

Slide 18

Millikanís Experiment

Millikanís Experiment

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Millikanís Experiment

Millikanís Experiment

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Millikanís Experiment

Millikanís Experiment

X-rays

X-rays give some drops a charge by knocking off electrons

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Millikanís Experiment

Millikanís Experiment

Slide 22

Millikanís Experiment

Millikanís Experiment

They put an electric charge on the plates

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Slide 23

Millikanís Experiment

Millikanís Experiment

Some drops would hover

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Slide 24

Millikanís Experiment

Millikanís Experiment

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