Developing the Atomic Theory

By Wasif lslam
  • 410

    Democritus

    Democritus
    Democritus believed that If matter was divided into smaller and smaller pieces, it would eventually lead to the smallest piece possible that he referred to as the atomos which is the Greek word for atom.
  • 410

    Aristotle

    Aristotle
    Aristotle believed that all matter was up of four elements earth, water, fire, and air.
  • Period: 410 to

    Atomic Theory

  • Sir Isaac Newton

    Sir Isaac Newton
    Sir Isaac Newton believed that atoms were pulled together by strong forces and attractions.

  • Robert Boyle

    Robert Boyle
    Robert Boyle helped develop a definition for the atomic theory and also helped out with the 'death' of the four elements: fire, air, water, earth.

  • Joseph Priestly

    Joseph Priestly
    Joseph Priestly discovered the gas named oxygen which has an atom number of 8.

  • Antoine Lavoisier

    Antoine Lavoisier
    Antoine Lavoisier created the principle of conservation of mass.

  • Dmitri Mendeleev

    Dmitri Mendeleev
    Dmitri Mendeleev created the periodic table of elements.

  • John Dalton

    John Dalton
    John Dalton proposed numerous basic ideas regarding the atom as well as devising a number of element symbols.

  • Ernest Rutherford

    Ernest Rutherford
    Ernest Rutherford revealed the atomic nucleus.

  • James Chadwick

    James Chadwick developed the theory “Inside the nucleus contains neutral particles called neutrons as well as positively charged particles called electrons.”