4.3 The Atom

By myesha
  • 460

    Democritus

    Democritus
    Matter is made of particles called atomos.
    -Atomos are solid and indivisible.
    - Different kinds of atomos have different sizes and shapes

  • Dalton

    Dalton
    •Matter is made of small particles called atoms.
    •Atoms of a given element are identical, but they differ from those of any other element.
    •Atoms are neither created nor destroyed by a chemical reaction, but they may be rearranged.

  • Thompson

    Thompson
    Discovered electrons with his cathode ray experiment.
    Developed “Plum Pudding “atomic model- negatively charged electrons in a “soup” of positive charges.

  • Rutherford

    Rutherford
    Most of the atom’s mass is in its nucleus.
    The Nucleus has a positive charge
    Electrons are in fixed orbitals surrounding the nucleus.

  • Bohr

    Bohr
    “Planetary “Atomic Model in which the nucleus is surrounded by electrons in orbitals with different energy levels

  • Schrödinger

    Schrödinger
    Quantum Mechanical Atomic Model
    Electrons orbitals have different shapes.
    Electrons are both particles and waves of energy at the same time.