Atom Theory

By endret
  • 440

    BC Democritus

    • Lived from 460BC-170BC• First atomic theory• Believed that everything in the universe was made up of atoms

  • Antoine Lavoisier

    • Born 1743• Died 1794• Discovered water is made of hydrogen and oxygen• Invented analytical balance• Showed chemical elements were neither created nor destroyed, they were combined into different compounds

  • John Dalton

    • Born September 6 1766• Died July 26 1844• Identified the hereditary nature of red-green colour blindness

  • Henri Becquerel

    • Born 15th December 1852• Died 25th August 1908• Discovered ofradioactivity• Won a Nobel Prize in physics

  • J.J. Thomson

    • Born: 18 December 1856• Died 30th August 1940 (aged 83)• Discovered electrons• Awarded Nobel prize in Physics in 1906

  • Hantaro Nagaoka

    • Born: 15th august 1865• Died: December 11 1850 (aged 85)• Suggested that an atom had a nucleous

  • Ernest Rutherford

    • Born on August 30th 1871• Stated that an atom has a dense positively charged nucleus

  • Neils Bohr

    • Born October 1885• Died 18th November 1963• He believed that electrons travel in stationary orbits defined by their angular momentum

  • Louis de Broglie

    • Born 15th August 1892• Died 19th march 1987 (aged 94)• Believed electrons could behave as waves under some conditions

  • Erwin Schrodinger

    • Born 12th August 1887• Died 4th January 1961• He determined where to find the electron in an atom

  • James Chadwick

    • Born 20th October 1891• Died 24th July 1974• Discovered neutron • Studied nuclear physics

  • Aristotle

    Had a theory that all matter consisted of earth, air, water and fire.