Evolution of the Atom By: Kevin Do

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Evolution of the Atom By: Kevin Do

Early Greeks ~400 BCE

1700's

1800's

1900's

Max Planack

Nagaoka Hantaro

Albert Einstien

Robert Millikan

Discovered the fact that all electrons carry the same amount of negative charge

Ernest Rutherford

Discovered the nucleus of an atom and created the Rutherford Atomic Model

Neils Bohr

Louis De Broglie

Erwin Schrodinger

Paul Dirac

James Chadwick

Discovered the neutron

Created a fully relativistic quantum theory.

Created the Schrödinger wave equation

Introduced the idea that particles have wave like properties

Modified the Rutherford Model to create the Bohr Model and discovered that electrons orbit the nucleus of fixed sizes and energies

Confirmed the existence of atoms and molecules using mathematical calculations.

Created the Saturnian model.

Theorized that matter emits/absorbs energy in small packets of energy called quantum.

John Dalton

Jöns Jacob Berzelius

Michael Faraday

Dmitri Mendeleev

George Johnson Stoney

Eugen Goldstein

J.J. Thomson

Henri Becquerel

Marie and Pierre Curie

Discovered Polonium, Radium and radioactivity originates within the atom itself.

Discovered radioactivity

Discovered electrons and created the Plum Pudding Model

Discovered protons

Determined the charge of the atom and created the term "electron"

Created the periodic table and arranged it according to atomic weight

Discovered that the structure of an atom was related to electricity/had an electric component to it

First person to measure atomic weights for elements

Discovered that all matter is made up of small particles called "atoms". Also created the Dalton Model

Isaac Newton

Joseph Priestley

Was the first person to discover that atoms were made of tiny particles

Suggested that all atoms either attract or repelled from each other by "forces".

Aristotle

Democritus

Thought all matter was created from tiny particles and that the properties of these particles also determined the properties of matter.

Thought all matter was made out of 5 elements: Earth, fire, air, water and ether.