A Brief History of the Atom & Atomic Models

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Presentation transcript:

A Brief History of the Atom & Atomic Models

Democritus 480 B.C. a Greek philosopher Theorized everything was made out of tiny particles – atoms Believed that atoms were hard, solid spheres that could not be destroyed Idea was controversial - had no evidence - no one believed him.

Democritus “The good things of life are produced by learning with hard work; the bad are reaped of their own accord, without hard work." "Fame and wealth without intelligence are dangerous possessions."

John Dalton English school teacher Formed his own atomic theory. Elements made of tiny particles -atoms. Atoms cannot be created or divided into smaller particles. Atoms of a an element are different from those of any other element. John Dalton

John Dalton Had evidence to support his idea - Democritus did not. Viewed the atom as a hard, solid spheres - could not be broken down. This theory was disproved by the discovery of electrons John Dalton

J.J. Thompson Discovered electron by using the cathode ray tube. Cathode rays were stream of (-) charged particles.

J.J. Thompson Model had (+) and (-) charges scattered throughout the atom. Known as chocolate chip cookie model. This model was disproven by discovery of the nucleus. Plum Pudding model

Ernest Rutherford Discovered nucleus by the Gold Foil Experiment. Angles of deflection that alpha particles (+) made proved evidence of a nucleus.

Model defines location and charge of nucleus – doesn’t clearly define location of the electrons. This model is IMPROVED by the Bohr model. Ernest Rutherford

Model depicts atom as small, (+) charged nucleus surrounded by electrons in orbit. Similar to the solar system, but with forces providing attraction, rather than gravity. Niels Bohr

Create a Flipbook Create a flipbook for Dalton, Thompson, Rutherford, and Bohr Include: Picture of their models Name of the specific part of the atom they discovered Explanation of how their model changed to previous ideas of what an atom looked like

The Current Atomic Model The current model is difficult to draw because electrons move freely around the nucleus in 3 dimensions Similar to people moving around the planet Earth.

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