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Atomic Theories

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Atomic Theories. Describe this muffin- Period 1. Describe this ... Describe this muffin- Period 3. Describe this Baseball- Period 3. Describe ... chip muffin ... – PowerPoint PPT presentation

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Title: Atomic Theories


1
Atomic Theories
2
Describe this muffin- Period 1
3
Describe this Baseball- Period 1
4
Describe this peach- Period 1
5
Describe this onion- Period 1
6
Describe this muffin- Period 3
7
Describe this Baseball- Period 3
8
Describe this peach- Period 3
9
Describe this onion- Period 3
10
Describe this muffin- Period 5
11
Describe this Baseball- Period 5
12
Describe this peach- Period 5
13
Describe this onion- Period 5
14
Describe this muffin- Period 6
15
Describe this Baseball- Period 6
16
Describe this peach- Period 6
17
Describe this onion- Period 6
18
Review from reading
  • An atom is made up of protons, neutrons and
    electrons.
  • The protons and neutrons are found in the nucleus
  • There has to be an equal number of protons and
    electrons
  • Atomic mass is the number of protons and neutrons
  • Atomic number is the number of protons (which is
    the same as the number of electrons)

19
John Dalton
  • Early 1800s
  • Pool Ball/Bowling Ball
  • Thought atoms were smooth, hard balls.
  • Cannot be broken into smaller pieces or divided
  • All elements are made of atoms
  • Atoms of different elements have different masses
    and characteristics
  • An atom of one element cannot be changed into an
    atom of a different element.
  • Atoms cannot be created nor destroyed only
    rearranged.
  • Compounds are made of atoms from different
    elements

20
J.J. Thomson
  • 1897
  • Berry or chocolate chip muffin
  • An atom consists of negative charges scattered
    throughout a ball of positive charges.

21
Ernest Rutherford
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  • (one of Thomsons students)
  • 1911
  • Peach
  • Positive charge (protons) is located in the
    center of the atom
  • Center is called the nucleus.
  • Almost all of the atoms mass is located in the
    nucleus.
  • Atom is mostly empty space with the electrons
    moving around the nucleus.

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22
Neils Bohr
  • (student of Thomsom and Rutherford)
  • 1913
  • Sliced Red onion Planets in the solar system
  • Electrons could have only specific amounts of
    energy, leading them to move in certain orbits

23
Modern Scientists
  • 1920s
  • Fan/Cloud
  • Electrons do not orbit the nucleus like planets
  • Electrons are in a cloudlike region around the
    nucleus.
  • Electrons of the same energy are in the same
    energy level.

24
James Chadwick
  • 1932
  • Fan/Cloud
  • Found that the atom has a particle that was
    electrically neutral (neutron).

25
Review Questions
  • 1. How is Thompsons atomic model different than
    Daltons?
  • 2. How is Bohrs atomic model different than
    Rutherfords?
  • 3. What did James Chadwick add to the modern
    atomic model?
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