chem

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Last updated 3:23 PM on 8/28/26
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14 Terms

1
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Democritus

Atomos theory

2
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John Dalton

Billiard Ball model - 1808

3
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proust’s law of definite proportions - 1799

Law of multiple proportions - all compounds of the same type have the same ratios

4
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J.J. Thompson

Plum Pudding model

5
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Wilhelm Rontgen

cathode rays

6
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Antoine Becquerel

uranium ores

7
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Marie Curie

radioactivity

8
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Ernest Rutherford

Nuclear model

9
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James Chadwick

Discovered neutrons 1992

10
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y

wavelength 10^-9 m

11
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E

energy Joules

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v

Frequency 1/seconds

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c

Speed of light - 3 × 10^8 m/s

14
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h

Planck’s Constant 6.626 × 10^-34 Js