Lecture 3 - Atomic Structures

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Last updated 7:48 PM on 9/19/26
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10 Terms

1
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What are atoms made of?

protons (+) neutrons (0) and electrons (-)

2
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Who discovered electrons and how?

J.J. Thomson in cathode-ray tube experiment

3
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How much heavier are protons than neutrons?

5000 times

4
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How heavy are neutrons compared to protons and electrons?

same as protons, heavier than electrons

5
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Where are protons and neutrons found?

nucleus

6
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What is another name for protons and neutrons?

nucleon

7
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Who discovered the nucleus and how?

Ernest Rutherford via the gold foil experiment

8
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Why don’t electrons just collapse into the nucleus?

because they are moving so rapidly

9
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How much smaller is the nucleus compared to the rest of the atom?

100,000 times smaller

10
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atomic number

number of protons in an element