HISTORY OF ATOMIC THEORY

DALTON'S ATOMIC THEORY

• All matter is made of atoms. Atoms are indivisible and indestructible.
• All atoms of a given element are identical in mass and properties

JJ THOMSON'S ATOMIC THEORY

• Thomson discovered the electron in the year 1897.
• His work put forward a new theory, that atom was made up of small particles.

ERNEST RUTHERFORD'S ATOMIC THEORY

• proposed the nuclear atom as the result of the gold-foil experiment in 1911
• Described the atom as having a central positive nucleus surrounded by negative orbiting electrons

NIELS BOHR'S ATOMIC THEORY

• This atomic theory was a combination of Rutherford’s work and ideas of the atom, with The Quantum Theory
• Rutherford’s atomic theory described an atomic model with all the mass concentrated in a nucleus with electrons circling the nucleus in an orbit.

IRENE CURIE'S ATOMIC THEORY

• She conducted different experiments using alpha particles and produced radioactive phosphorus.

ROBERT MILLIKAN'S ATOMIC THEORY

• Millikan had great contribution He performed the Oil drop Experiment. and mass of an electron.
• This helped in determining the charge and mass of an electron

BIBLIOGRAPHY

• http://www.sciencegeek.net/Chemistry/Powerpoint2/AtomicStructure.ppsx
• http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1935/joliot-curi...
• http://www.aip.org/history/electron/jjhome.htm
• http://cstl-csm.semo.edu/mcgowan/ch181/atomhist.htm
• http://www.rsc.org/chemsoc/timeline/pages/1911.html