Ideas on Atomic Theory

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Last updated 12:53 PM on 9/2/26
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7 Terms

1
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Dalton’s atomic theory

  1. Matter is composed of super-small particles called atoms

  2. An element is made up of only one kind of atom

  3. Atoms of one element differ in properties in comparison to atoms of another element

  4. A compound of atoms always has a specific ratio

  5. Atoms can not be created or destroyed


2
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Law of constant composition

Elements in a given compound always exist in the same ratio

3
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Law of multiple proportions

When two elements combine to make different things, their weights always fit into clean, simple fractions

4
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Millikan Oil Drop Experiment

  • Looking at tiny droplets suspended in an electric field

  • He was able to measure the charge of the electron


5
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JJ Thompson

  • Thomson used a cathode ray tube to identify the charge-to-mass ratio of the electron

  • He was able to find the mass of an electron


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Rutherford Gold Foil Experiment

  • The nucleus is small, tightly compacted, and positive

  • Atoms are mostly space


7
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Soddy and Chadwick

Soddy- He was able to discover that different atomic masses led to isotopes

Chadwick- he discovered the neutron that led to different isotopes