Timeline

By ndrimmel
  • 900 BCE

    The Alchemists

    The Alchemists
    He tried to turned other substantive such as lead to gold. Ideas led to combining elements.
  • 465 BCE

    Democritus

    Democritus
    Came to the conclusion that everything was made up of tiny indestructible particles that he named "atoms".
  • 427 BCE

    Plato

    Plato
    He identified the known elements fire, water, earth, air, and cosmos. He also laid down the fundamentals of philosophy, and developed the Platonic Theory.

  • Robert Boyle

    Robert Boyle
    He disproved the "four element theory", and helped define the definition of element. Robert also discovered atomic compounds are combinations of elements, and that elements cannot be broken down any further.

  • Antione Lavoisier

    Antione Lavoisier
    He found out that mass never changes, and also helped construct the metric system. He's also known as the father of chemistry, and Antoine discovered the role of oxygen in combustion.

  • John Dalton

    John Dalton
    Dalton's Law, and first scientist who studied atoms on mass and weight. Theory that all matter is made of atoms, the figured out atoms couldn't be created or destroyed.

  • Dimitri Mendeleev

    Dimitri Mendeleev
    He discovered the periodic law 1969. Physical and chemical properties were related to atomic mass. Elements with similar properties fell under the same vertical in the periodic table.

  • Marie Curie

    Marie Curie
    Discovered radioactivity in 1898 and she figured out that it's lethal, because she also died from it. She figured out that elements lose electrons over time.

  • Albert Einstein

    Albert Einstein
    Used diffusion to determine the size of molecules and atoms. He invented the equation e=mcsq. He also had the theory of relatively.

  • Ernest Rutherford

    Ernest Rutherford
    Discovered the nucleus and completed the Gold Foil Experiment.

  • JJ Thomposon

    JJ Thomposon
    He used cathode rays to map electrons, and was one of the contributors to the Spectrograph

  • Niehls Bohr

    Niehls Bohr
    He discovered atom in 1913 and Noble Prize in 1922. Niehls found out that Electrons on the outer orbit determine the properties of the atom. Electrons have separate orbits.

  • Henry G.J Mosely

    Henry G.J Mosely
    He made the atomic battery, and X-ray's. He used X-Ray's to correct elements positioning on the Periodic Table.