Atomic Theory

by moneyk123
Last updated 5 years ago

Discipline:
Science
Subject:
Chemistry
Grade:
10

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Atomic Theory

Niels Bohr

Atomic Theory

By: Makayla Headley

400BC

Democritus

-Matter is made of small particles called atoms - Atoms of a given element are identical, but they difer from those of any other element

-discovered electrons with his cathode ray experiment - developed "Plum Pudding" atomic model - negatively charged electrons float around in a "soup" of positive charge

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- matter is made of particles called atomos - atomos are solids and indivisible - different kinds of atomos have different and shapes

1803

John Dalton

1904

J.J. Thomson

1910

1913

Ernest Rutherford

1926

Erwin Schrodinger

- used his gold foil experiments to determine that - most of an atoms mass is in its nuclues - the nuclues has a positive charge - electrons are in fixed orbital surrounding the nuclues

- "Planetary" Atomic Model in which the nulues is surrounded by electrons in orbitals with different energy levels

- Quentum Mechanical Atomic Model - electron orbitals have differnt shapes - electrons are both particles and waves of energy at the same time


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