AP CHEMISTRY
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Chemistry
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12th Grade
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Hard
Aayushi R
Used 8+ times
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15 Slides • 0 Questions
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AP CHEMISTRY
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STRUCTURE OF ATOM
HISTORY OF ATOMIC CHEMISTRY
1. Greek Philosopher, Leucipuus and his student Demucritus, gave the term 'Atomos'.
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HISTORY OF THE ATOMIC THEORY
Antoine Lavoisier proposed the law of conservation of mass
John Dalton said that elements exists as discrete packets of indivisible matter.
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Discovery of sub-atomic particles
Eugen Goldstein first used the cathode rays
Discovered the positive (canal) rays.
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Thompson's Ray Experiment
J.J. Thompson determined the mass of the cathode rays
Concluded that cathode rays indeed were small masses
Called them "corpuscles"
Gave the "Plum-pudding model"
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Rutherford's Experiment
Did the famous Gold foil experiment
Discovered the nucleus
Nucleus had all the positive charge
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Bohr's Atomic Model
Analyzed the Gold foil Experiment
Gave the planetary model for the arrangement of electrons
Nearly accurate model till-then
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Heisenberg's uncertainity principle
The momentum of the electron
Position of the electron
Gave way for the Quantum theory of atomic structure.
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Quantum Model of the Atom
The probable presence of electrons can be predicted
Generally present in orbitals, namely the s,p,d and f-orbitals
Described as the balloon model.
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