Atom Timeline

By kbraley
  • 400

    Leucippus

    Founder of the Atomism
  • 460

    Democritus

    Democritus
    • The laughing philosopher
      • He thought that atoms are solid and their density is around the same size as their volume.
      • atomic theory "Nothing exists except atoms and empty space. Everything else is opinion."

  • Robert Boyle

    He revived the atomic theory.

  • Joseph Priestly

    Discovered oxygen
    • in His writings of electricity he discovered many gases.

  • Antoine Lavoisier

    • He discovered that matter can not be created or destroyed.
      • Defined the difference between the matter and a compound.

  • Charles Coulomb

    • Came up with a mathematical formula for the charges between electrons. -- F is the force q1and q2 are the charges. And r is the distance between.

  • Joseph Proust

    • Made his own law about definite proportions.
    • All elements contained compounds

  • John Dalton

    -The modern atomic theory "All atoms in a given element are exactly alike, while the atoms in different elements differ by atomic weight."

  • James Clark Maxwell

    • He predicted that when they were accelerating, they were traveling in waves at the speed of light.
      • These waves became known as electromagnetic waves.

  • J.J Thompson

    J.J Thompson
    • Discovered the Electron with its negative charge.
      • Plum pudding model- the electrons were evenly disperse with the positive protons.

  • Max Plank

    • Introduced the quantum theory.
      • E=hc/A -This explained the shape of the temperature vs. the color curve.

  • Henri Becqurel

    • Discovered radioactivity

  • Marie Curie

    won the nobel prize for phisics

  • Hans Geiger

    Introduced the first detection of individual alpha particles.

  • Dmitri Mendeleev

    • Discovered and produced the first periodical table with elements.

  • Earnest Rutherford

    Earnest Rutherford
    • Atoms are made up of mostly space.
      -They have a positive charged nucleus.
      • With negative electrons orbiting around it.

  • Electron Cloud Atom

    Electron Cloud Atom
    Ernest Rutherford, Neils Bohr, and Werner Heisenberg came up with this theory.

  • Marie Curie

    • Won the nobel Prize for Chemistry.
    • Worked more with radioactivity

  • Neils Bohr

    Neils Bohr
    • Developed the first successful model of an atom

  • H.G.J Moseley

    • Discovered the atomic number
    • Came up with the Moseley’s Law

  • Robert A. Millikan

    -Measured the charge on electrons
    • Photoelectric effect

  • Louis de Broglie

    - He claimed that every particle with a momentum has an equivalent wavelength. - (P=mv) wavelength of λ

  • James Chadwick

    -Discovered the neutron

  • Erwin Schrodinger

    -Proposed the Schrodingers cat thought experiment.
    • This was about his problems with the quantum mechanics applied.

  • Detailed electron cloud atom

    Detailed electron cloud atom
    This was the last model created or discovered from the research i have found