Transcript John Daltons Atomic Theory

John Daltons Atomic Theory
• All matter is composed of small
particles called atoms
• All atoms of a given element are a like
• Compounds are formed when different
atoms combine in fixed proportions
• A chemical reaction involves the
rearrangement of atoms
Development of the Atom
• John Dalton - Produced the first atomic
theory Taught that atoms were hard round
spheres
Development of the Atom
• John Dalton (1803) - Produced the first atomic
theory Taught that atoms were hard round
spheres
• Michael Faraday (1825)- Split compounds by
electrolysis and showed that atoms have
electrical properties
Ions - Charged atoms
Cation - positive charged
atom
Anion - negative charged
atom
Development of the Atom
• John Dalton - Produced the first atomic theory
Taught that atoms were hard round spheres
• Michael Faraday - Split compounds by
electrolysis and showed that atoms have
electrical properties
• Joseph John Thompson - Used cathode ray
tube to discover the negative charged
electron and the mass to charge ration on the
electron
Development of the Atom
• John Dalton - Produced the first atomic theory
Taught that atoms were hard round spheres
• Michael Faraday - Split compounds by
electrolysis and showed that atoms have
electrical properties
• Joseph John Thompson - Used cathode ray
tube to discover the negative charged
electron and the mass to charge ratio on the
electron
• Eugene Goldstein - Discovered the proton.
Found mass to be 1837 time the electron and
+ charged
Development of the Atom
• Joseph John Thompson - Used cathode ray
tube to discover the negative charged
electron and the mass to charge ratio on the
electron
• Eugene Goldstein - Discovered the proton.
Found mass to be 1837 time the electron and
+ charged
• Robert Millkan - Determined the electron
charge, using oil drop experiment
Development of the Atom
• Eugene Goldstein - Discovered the proton.
Found mass to be 1837 time the electron and
+ charged
• Robert Millkan - Determined the electron
charge
• Dmitri Mendeleev - Father of the periodic
table – predicted that his unfilled table
represented undiscovered elements
Other Contributors
• Wilhelm (Conrad) Roentgen – X-Ray’s
• Henri Becquerel – Radioactivity
• Marie Curi – Intensity of Radioactivity