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Electron Configurations

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Electron Configurations 03/28/12 N. Bohr 1913 Electrons travel in definite paths. Electrons jump between levels from path to path. Bohr Model of the Atom Electron ... – PowerPoint PPT presentation

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Title: Electron Configurations


1
Electron Configurations
  • 03/28/12

2
N. Bohr1913
  • Electrons travel in definite paths.
  • Electrons jump between levels
  • from path to path.

Bohr Model of the Atom
3
Electron Energy Levels
  • Any of the several different regions in which
    electrons travel about the nucleus.
  • As electrons increase in energy, they occupy
    energy levels farther from the nucleus.

4
Bohr Diagram
  • First energy level is filled with 2 electrons.
  • Second energy level is filled with 8 electrons
  • Third energy level is filled with 18 electrons

1st energy level
2nd energy level
3rd energy level
P N
Nucleus
5
Valence electrons
  • Outermost energy level of an atom is called
    valence shell.
  • Electrons in valence shell are called valence
    electrons.
  • Group number indicates the number of valence
    electrons.

6
How do you determine the number of energy levels?
  • Period number determines the number of energy
    levels.
  • Example Sodium is in period 3, so it has 3
    energy levels

7
Electron configurations
  • Boron Atomic number 5, Mass number 11
  • Number of protons number of electrons 5

8
Example - Sodium
  • Atomic number 11, Mass number 23

9
Example - Calcium
  • Atomic number 20, Mass number 40

10
Practice
11
Practice
12
Practice
13
Practice
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