chapter 7-1 electrons and their energy levels part 2

Chapter 7-1 Electrons and their Energy Levels Part 2

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Chapter 7-1Electrons and their

Energy Levels

Part 2

• The period on the periodic table represents the number of energy levels of electrons in an atom.

• example: Carbon is in period 2 because it has 2 energy levels

Energy Levels

• Valence electrons are located only in the outer energy level.

• Outer energy levels are considered full or stable (inert) with eight electrons.

• Example: Neon has eight valence electrons. The noble gases are stable or inert.--Bohr Sketch --Lewis Structure

Valence Electrons

Page 4: Chapter 7-1 Electrons and their Energy Levels Part 2

• There is a maximum number of electrons for each energy level.

• Energy levels do not have to be filled to the maximum before a higher energy level begins.

• Example: Nickel electron configurationNi 2 8 16 2

Page 5: Chapter 7-1 Electrons and their Energy Levels Part 2

• Valence electrons determine how an atom will react with other atoms.

Page 6: Chapter 7-1 Electrons and their Energy Levels Part 2

• Lewis Structures or Electron Dot Formulas show only valence electrons.

• Eight electrons (stable) is the most you can show on any atom.

• The noble gases have a full outer energy level and are stable or inert.

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