kiara b 2

By kiarabayles
  • 428 BCE

    plato

    plato
    Plato was a Greek philosopher that founded the Platonist school of thought and the Academy,
  • 322 BCE

    Aristotle

    Aristotle
    Aristotle was a Greek philosopher and polymath during a classical time in ancient greece

  • Lavoisier

    Lavoisier
    discovered the role of oxygen in combustion and respiration, proved the law of conservation, reformed the chemical nomenclature, and named hydrogen.

  • john dalton

    john dalton
    all matter was comprised of indivisible and indestructible atoms with distinct masses and properties,

  • newland's law of octaves

    newland's law of octaves
    if the chemicals are arranged in a certain way, the ones with similar properties occur with the elements that are similar

  • Mendeleev's Pd. Table

    Mendeleev's Pd. Table
    Mendeleev realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way,

  • photoelectric effect

    photoelectric effect
    phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation

  • Discovery of radioactivity

    Discovery of radioactivity
    Henri Becquerel Discovers Radioactivity, French physicist Henri Becquerel opened a drawer and discovered spontaneous radioactivity.

  • Discovery of the electron

    Discovery of the electron
    J.J Thompson discovered the electron in 1897

  • Discovery of the proton

    Discovery of the proton
    The proton was discovered by Ernest Rutheford in the early 1900's resulted in a nuclear reaction which led to the first 'splitting' of the atom, where he discovered protons

  • Plum pudding model

    Plum pudding model
    a historical scientific model of the atom.

  • Rutherford's gold foil expiriment

    Rutherford's gold foil expiriment
    A piece of gold foil was hit with particles, which have a positive charge. Most alpha particles went right through. This showed that the gold atoms were mostly empty space.

  • Charge of the electron

    Charge of the electron
    It carries a negative charge of 1.602176634 × 10−19 coulomb, which is considered the basic unit of electric charge.

  • Borh's planetary model

    Borh's planetary model
    the electrons travel around the nucleus of an atom in orbits

  • Mosley's atomic numbers

    , he discovered a systematic relation between wave- length and atomic number 43, 61, and 75 (atomic numbers)

  • Heisenberg Uncertainty Principle

    Heisenberg Uncertainty Principle
    we cannot know both the position and speed of a particle, such as a photon or electron, with perfect accuracy

  • Discovery of the Nuetron

    Discovery of the Nuetron
    In May 1932 James Chadwick announced that the core also contained a new uncharged particle, which he called the neutron. Chadwick was born in1891 in Manchester, England

  • Robert millikan

    Robert millikan
    the elementary charge of an electron using the oil-drop experiment.