Atomic Timeline

By tessavivier
  • 500 BCE

    The Alchemists

    The Alchemists
    Created a scientific theory, by studying different natural processes which is used by scientists today. The idea was that all metals were composed of sulfur and mercury in different proportions,
  • 430 BCE

    Democritus

    Democritus
    Proposed matter was formed of different types of tiny desecrate particles and that the properties determine the properties of matter.
  • 300 BCE

    Solar System Model

    Solar System Model
  • 44 BCE

    Plato

    Plato
    Theorized that solid forms of matter are composed of indivisible elements shaped like triangles.

  • Robert Boyle

    Robert Boyle
    Known as the "father of modern chemistry", he discovered the relation between pressure and volume which showed that matter is made of tiny particles called atoms.

  • Antoine Lavoisier

    Antoine Lavoisier
    Defined elements as chemicals that can't be broken down into other substances through chemical analysis.

  • John Dalton

    John Dalton
    He created the atomic theory and said that elements consist of particles, and all atoms are identical and can't be destroyed.

  • Billiard Ball Model

    Billiard Ball Model

  • Amedeo Avogrado

    Amedeo Avogrado
    Created a principle that states that equal volumes of gases at the same temp and pressure contain the same number of molecules regardless of the physical and chemical nature

  • Dmitri Mendeleev

    Dmitri Mendeleev
    Came up with a law that states that elements are arranged according to the value of their atomic weights. He also created the periodic table.

  • JJ Thompson

    JJ Thompson
    Discovered that atoms were made up of smaller components.

  • Pierre and Marie Curie

    Pierre and Marie Curie
    Discovered the strongly radioactive elements polonium and radium. Also that these elements were tiny particles from atoms

  • Plum Pudding Model

    Plum Pudding Model

  • Albert Einstein

    Albert Einstein
    Proved the existence of atoms and molecules mathematically. He figured this out by the movement of liquid caused by Brownian motion.

  • Robert Millikan

    Robert Millikan
    Succeeded in determining the magnitude of the electrons charge by using an oil drop expirament.

  • Ernest Rutherford

    Ernest Rutherford
    Established that the mass of the atoms is concentrated in the nucleus, he describes the atoms having a tiny dense and positively charged core.

  • Neils Bohr

    Neils Bohr
    Created a model of an atom, which protons and neutrons. The model suggests the electrons orbit the nucleus at fixed energy levels.

  • Henry G Mosely

    Henry G Mosely
    Published a paper where he concluded that the atomic number is the number of positive charges in an atomic nucleus

  • Werner Heisenberg

    Werner Heisenberg
    Created a type of quantum mechanics based on matrices which was the quantum theory.

  • Erwin Schrodinger

    Erwin Schrodinger
    Theorized that the behavior of electrons within atoms could be explained by treating them mathematically.

  • Electron Cloud Model

    Electron Cloud Model

  • James Chadwich

    James Chadwich
    Found that atoms consisted of protons and electrons, and another subatomic particle called a neutron.