History of the Atomic Structure

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Development of the Atomic Theory

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Presentation transcript:

History of the Atomic Structure

Democritus 440 BC Greek philosopher that proposed that atoms are small, hard particles that are made up of a single material formed into different shapes and sizes Atom comes from the Greek work atomos, meaning “not able to be divided”

Aristotle 350 BC Disagreed with Democritus believed you would never end up with a particle that could not be cut WRONG!!!

John Dalton 1803 Atomic Theory- All substances are made of atoms. Atoms are small particles that cannot be divided, created, or destroyed. Atoms of the same element are exactly alike, and atoms of different elements are different. Atoms join together with other atoms to make new substances.

JJ Thomson 1897 Discovered that there were small particles inside the atom means atoms can be divided into even smaller parts Experimentation with cathode-ray tube discovered electron Plum-pudding model thought electrons were mixed throughout the atom like plums in a pudding  WRONG

Ernest Rutherford Gold-Foil Experiment discovered positive center (nucleus) that has a large mass and contains protons (were NOT aware of neutrons yet) disproved Thomson’s plum pudding model Discovered atom has a lot of empty space http://www.youtube.com/watch?v=5pZj0u_XMbc

Niels Bohr 1913 Danish scientist who worked with Rutherford Studied the way atoms react to light Proposed that electrons move around the nucleus in certain paths or energy levels

Erwin Schrodinger & Werner Heisenberg 1926 Electrons do not move in definite paths as Bohr suggested exact path cannot be predicted Electron cloud region around nucleus where electrons are likely to be found

James Chadwick 1932 Discovered neutron while discovering atomic disintegration determined that the neutron’s mass was about 0.1 percent more than the proton's