Chemistry Dead Guys

By TheGreatPlantain
  • 101

    Democritus - 429 BC

    First person to think of the atom
    Thought atom was a solid circle
  • 102

    Aristotle - 400 BC

    Proposed that everything was made up of air, fire, earth, and water.

  • Isaac Newton

    Believed there were pieces of mass floating everywhere.

  • John Dalton

    Dalton's Atomic Theory:
    1. All matter is composed of atoms - True
    2. Atoms cannot be made or destroyed - True
    3. All atoms of the same elements are identical - False
    4. Different elements have different types of atoms - True
    5. Chemical reactions occur when atoms are rearranged - True
    6. Compounds are formed from atoms of different elements - True

  • Henri Becquerel

    He helped discover radioactivity

  • Joseph John Thompson

    Proved the existence of negatively charged particles, later called electrons.

  • Robert Andrews Millikan

    Measured the charge of an electron
    Measured the mass of an electron

  • Ernest Rutherford

    Found that an atom has a central positive nucleus surrounded by negative orbiting electrons

  • Neils Bohr

    Depicted atom as small, positively charged nucleus surrounded by electrons
    Electrons travel in circular orbit

  • Francis Aston

    Discovered isotopes of non-radiactive elements

  • Erwin

    Atom consists of nucleus and clouds
    Discovered formula that calculated where an electron might be

  • James Chadwick

    Discovered neutron