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

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

Democritus

Democritus

• Indivisible Particle

• “Atomos“

Aristotle

• All matter is

  • earth

  • fire

  • wind

  • water

Dmitri Mendeleev

• “Father of the Modern Periodic Table“

  • organized by atomic weight

  • discovered periodic trends

    • predicted future elements

Henry Moseley

• Reorganized periodic table

  • based on atomic number

John Dalton (1808)

• Published First Atomic Theory

• All atoms of an element are identical

• Solid Ball

J.J. Thomson (1897)

• Discovered electrons

• Negative Particles in a Positive Atom

• Plum Pudding Model

Ernest Rutherford (1911)

• Atom is mostly empty space

• Discovers positive nucleus

• Performed Gold Foil Experiment

Niels Bohr (1913)

• Electrons orbit the nucleus

• Electron jumping

• Planetary Model

Erwin Schrodinger (1926)

• Electron Orbitals

• Electron Cloud Model

James Chadwick (1932)

• Discovered neutrons

• Neutron Model