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Atomic Theory. Cierra Franklin Chemistry September 20, 2011. Democritius. Greek Philosopher 4 th Century Was the first to discover the atom. Concluded that it can’t be broken down. Aristotle and Plato didn’t agree with him. John Dalton. 1766-1844 Formulated the “Atomic Theory”.

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Atomic theory

Atomic Theory

Cierra Franklin

Chemistry

September 20, 2011


Democritius
Democritius

  • Greek Philosopher

  • 4th Century

  • Was the first to discover the atom.

  • Concluded that it can’t be broken down.

  • Aristotle and Plato didn’t agree with him.


John dalton
John Dalton

  • 1766-1844

  • Formulated the “Atomic Theory”


Jj thomson
JJ Thomson

  • 1897

  • Discovered the electron (-) while experimenting with cathrode rays.

  • Estimated weight 1/1840

  • Plum Pudding Model


Robert millikan
Robert Millikan

  • 1909

  • The “Oil Drop” experiment.

  • Measured the elementary electric charge (the charge of the electron)


Ernest rutherford
Ernest Rutherford

  • 1891-1974

  • “Goil Foil” Experiment in 1910.

  • Results: Positively charged nucleus; a small core.


James chadwick
James Chadwick

  • 1891-1974

  • Discovered the neutron in 1932.

  • The neutron surrounds the nucleus.


Neils bohr
Neils Bohr

  • 1885-1962

  • Neils Bohr Model (1913)

  • Electrons orbit the nucleus in circular paths of fixed energy.

  • N= energy levels


Quantum mechanical model
Quantum Mechanical Model

  • Deals with subatomic particles as well as atoms, molecules, elements, compounds and much longer systems.

  • Associated with the quantum theory “matter also has the properties associated with waves.”

  • Used to explain observations made on complex atoms.

  • Deals with mathematics.


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