who discovered it by Dalton and Mackenzie

By lovethepounds
  • introduced the concept of the atom
    450

    introduced the concept of the atom

    Democritus 450 - 420 B.C.
  • The old bouleuterion
    450

    The old bouleuterion

    the west side of the agora in Athens, is built
  • orbitals
    Sep 18, 1000

    orbitals

  • energy levels
    Sep 18, 1100

    energy levels

  • protons and neutrons
    Sep 18, 1200

    protons and neutrons

  • nucleus
    Sep 18, 1300

    nucleus

  • electrons
    Sep 18, 1400

    electrons

  • concept of the atom
    Sep 18, 1500

    concept of the atom

  • discovered that electrons move in orbitals

    discovered that electrons move in orbitals

    Bohr Neils Henrik David by investigating atomic structure and radiation
  • !st meteor

    !st meteor

    The 1st meteor is photographed
  • discovered atoms have electrons

    discovered atoms have electrons

    J.J. Thompson, he discovered it by the Atomic Theory of Matter
  • San Diego State

    San Diego State

    San Diego State University is founded.
  • discovered atoms have a nucleus

    discovered atoms have a nucleus

    Earnest Rutherford by using gold foil expirament
  • Tripolitan War

    Tripolitan War

    he Italians declared war on Turkey in September.
  • discovered that atoms are at different energy levels

    discovered that atoms are at different energy levels

    Neils Bohr by observing the spectral lines of emitted radiation when the atoms are excited
  • Woolworth Building

    Woolworth Building

    The skyscraper Woolworth Building in New York City is opened.
  • discoved that there are protons

    discoved that there are protons

    Ernest Rutherford, by an expirament that sent alpha particles through nitrogen gas.
  • Mississippi and 18th amemndment

    Mississippi and 18th amemndment

    Mississippi becomes 1st state to ratify 18th amendment
  • Discovered Neutrons

    Discovered Neutrons

    James Chadwick by a series of expiraments