Chemistry Scientists

By dadef
  • 400 BCE

    Democritus

    Democritus
    What he hypothesized:
    Democritus hypothesized that atoms cannot be destroyed, differ in size, shape and temperature, are always moving, and are invisible. He believed that there are an infinite number of atoms.
  • 322 BCE

    Aristotle

    Aristotle
    There are only four elements that the world is made up of Earth, fire, water, air. He also proposed a fifth element, aether.

  • John Dalton

    John Dalton
    His atomic theory said that elements consisted of tiny particles called atoms. A compound is a pure (one of a kind) substance due to different elements bonded together. They are not easily separated from one another.

  • J.J. Thomson

    J.J. Thomson
    J.J. Thomson discovered the Electron.

  • Marie Curie

    Marie Curie
    She announced the discovery of two new elements, radium and polonium.

  • Ernest Rutherford

    Ernest Rutherford
    Rutherford discovered that atoms have small, charged nuclei.

  • Neils Bohr

    Neils Bohr
    Bohr proposed his quantized shell model of the atom to explain how electrons can have stable orbits around the nucleus.

  • Max Planck

    Max Planck
    Max Planck originated the Quantum Theory

  • Robert Millikan

    Robert Millikan
    R. Millikan made it possible to measure the charge of an electron

  • Werner Heisenberg

    Werner Heisenberg
    Werner Heisenberg created the Theory of Uncertainty Principle

  • Erwin Schrodinger

    Erwin Schrodinger
    Schrödinger used mathematical equations to describe the likelihood of finding an electron in a certain position.

  • Louis de Broglie

    Louis de Broglie
    His discovery was that electrons have properties of both waves and particles

  • James Chadwick

    James Chadwick
    James Chadwick discovered the Neutron