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History of the Atom

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laurel pederson

on 4 December 2017

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Transcript of History of the Atom

History of the Atom

Democritus
(460 BC – 370 BC)

Proposed Atomic Theory
Antoine Lavoisier
(1743 – 1794)

Law of Conservation of Mass (or Matter)
John Dalton
(1766 – 1844)


Atomic Theory:
J.J. Thomson
(1856 – 1940)

Proved that an atom can be divided into smaller parts

Image by goodtextures: http://fav.me/d2he3r8
BY: GRACE HEDGER AND LAUREL PEDERSON
Period 1

All atoms are small, hard, indivisible and indestructible particles
Made of a single material formed into different shapes and sizes
matter is neither created nor destroyed during ordinary chemical or physical changes

electrons

Stated that the atom is neutral

Plum Pudding Model
Matter is composed of
units called atoms that can be neither created nor destroyed.
Ernest Rutherford
(1871-1937)
He came up with a model that consisted of a dense nucleus made up of protons.
same mass, size and other properties
Niels Bohr
(1885 – 1962)

Bohr Model
electrons travel around the nucleus of an atom in orbits or definite paths
Erwin Schrodinger
(1887-1965)
electrons can jump from a path depending on their energy
Electrons are located in electron clouds.
Gold Foil Experiment
discovered the nucleus
James Chadwick
(1891-1974)
atom neutral

In 1932, he discovered the neutron. He was a part of the Manhattan Project and he won a Nobel Prize.
atomic mass of most elements was double the number of protons
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