Chemistry - History, Important Figures, and Trends of Atomic Theory + Figures of the Periodic Table

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Contains key dates, scientists, and models of the atom and the history and the Periodic Table.

Chemistry

Atoms

A-Level Chemistry

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10 Terms

1
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<p>Democritus</p>

Democritus

  • Indivisible Particle

  • “Atomos“

2
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Aristotle

  • All matter is

    • earth

    • fire

    • wind

    • water

3
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Dmitri Mendeleev

  • “Father of the Modern Periodic Table“

    • organized by atomic weight

    • discovered periodic trends

      • predicted future elements

<ul><li><p>“Father of the Modern Periodic Table“</p><ul><li><p>organized by atomic weight</p></li><li><p>discovered<strong> </strong>periodic trends</p><ul><li><p>predicted future elements</p></li></ul></li></ul></li></ul>
4
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Henry Moseley

  • Reorganized periodic table

    • based on atomic number

5
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John Dalton (1808)

  • Published First Atomic Theory

  • All atoms of an element are identical

  • Solid Ball

<ul><li><p>Published First Atomic Theory</p></li></ul><ul><li><p>All atoms of an element are identical</p></li></ul><ul><li><p>Solid Ball</p></li></ul>
6
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J.J. Thomson (1897)

  • Discovered electrons

  • Negative Particles in a Positive Atom

  • Plum Pudding Model

<ul><li><p>Discovered electrons</p></li></ul><ul><li><p>Negative Particles in a Positive Atom</p></li></ul><ul><li><p>Plum Pudding Model</p></li></ul>
7
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Ernest Rutherford (1911)

  • Atom is mostly empty space

  • Discovers positive nucleus

  • Performed Gold Foil Experiment

<ul><li><p>Atom is mostly empty space</p></li></ul><ul><li><p>Discovers positive nucleus</p></li><li><p>Performed Gold Foil Experiment</p></li></ul>
8
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Niels Bohr (1913)

  • Electrons orbit the nucleus

  • Electron jumping

  • Planetary Model

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Erwin Schrodinger (1926)

  • Electron Orbitals

  • Electron Cloud Model

<ul><li><p>Electron Orbitals</p></li><li><p>Electron Cloud Model</p></li></ul>
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James Chadwick (1932)

  • Discovered neutrons

  • Neutron Model

<ul><li><p>Discovered neutrons</p></li><li><p>Neutron Model</p></li></ul>

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