Atomic Theory through the ages

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Chemistry

Atoms

science

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7 Terms

1
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Democritus

All matter is made from indivisible particles called atomos

2
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Dalton

Agree that matter is made from indestructible particles called atoms

3
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Thomson

Plum pudding model

4
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Rutherford

Prove that electrons orbit protons through gold foil experiment

5
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Bohr

Find that electrons orbit protons in fixed shells with fixed number of electrons in each one

6
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Mendeleev

Organise elements in order of atomic mass with considerations of physical and chemical properties

7
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Chadwick

Discovers the neutron, which helps balance out protons in the nucleus