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Valence Electrons

  • Valence Electrons - electrons in the outermost energy level/shell.
  • Groups tells you the number of valence electrons.
  • Periods tell you the number of shells/energy levels/orbitals (electron cloud)

# of

shells

1

2

3

4

5

6

7

Niels Bohr

Shells/Energy Levels

3

2

1

Nucleus

  • 1st Energy Level = 2 electrons
  • 2nd Energy Level = 8 electrons
  • 3rd Energy Level = 8 electrons

Bohr Models

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