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Atomic Theory

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Atomic Theory Let s Take a Trip Through Time! Atomic Theories Timeline Name Democritus Dalton Thompson Rutherford Bohr Schr dinger Heisenberg Time Frame Key Points ... – PowerPoint PPT presentation

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Title: Atomic Theory


1
Atomic Theory
2
Lets Take a Trip Through Time!

3
Atomic Theories Timeline
Name Democritus Dalton Thompson Rutherford Bohr Schrödinger Heisenberg
Time Frame
Key Points
Copy all notes in red on your graphic organizer
through slide 17!
4
Democritus400 B.C.
  • There are various basic elements from which all
    matter is made
  • Everything is composed of small atoms
  • Some atoms are round, pointy, oily, have hooks,
    etc. to account for their properties

5
Democrituss Model

6
John Dalton
  • Introduced his ideas in 1803
  • Each element is composed of extremely small
    particles called atoms
  • All the atoms of a given element are identical,
    but they differ from those of any other element
  • Atoms are neither created nor destroyed in any
    chemical reaction

7
Daltons Model

8
J.J. Thompson1904
  • Discovered electron (negative particle) in the
    Cathode Ray Experiment
  • Plum Pudding model 1904
  • Electrons in a soup of protons (positive charges)
  • There is an equal number of positive and negative
    charges because the atom is neutral

9
Cathode Ray Tube Experiment

10
Thompsons Model
Protons
Electrons
11
Ernest Rutherford1910
  • Nucleus Theory 1910
  • alpha particle gold foil experiment
  • An atoms mass is mostly in the nucleus
  • The nucleus has a positive charge because it
    contains the protons and because it is so large
    in mass it contains another particle called the
    neutrons(neutral)
  • Electrons in fixed orbit

12
Alpha Particle Experiment

13
Rutherford Model

14
Niels Bohr1913
  • Planetary Model 1913
  • Nucleus surrounded by orbiting electrons at
    different energy levels
  • Electrons have definite orbits
  • Worked on the Manhattan Project (US atomic bomb)

15
Bohrs Model
Neutrons (No charge)

Electrons (negative charge)
Protons (positive charge)
16
Ernst Schrödinger
Werner Heisenberg
  • Quantum Mechanical Model 1926
  • Electrons are in probability zones called
    orbitals, not orbits and the location cannot be
    pinpointed and they are constantly moving (they
    are not moving in circular orbits)
  • Schrödinger and Heisenburgs Model of the Atom is
    the Model still accepted today.

17
Schrödinger and Heisenburgs Model of the Atom

18
(No Transcript)
19
Timeline Activity
  • You are going to construct a timeline of the
    development of the atom. It must include
  • Dates (5 points)
  • Scientists (5 points)
  • A description of the discovery (20 points)
  • A drawing of the atom (10 points)
  • Appearance/Colorful (10 points)
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