Chemical Bonds

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Chemical Bonds

• 8th 4.1 Why Do Atoms Combine?

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Atoms Combine

• Electron Cloud area of space around a nucleus
  where an atoms electrons travel
• Electrons travel in predictable orbits around the
  nucleus
• The number of protons and electrons will be the
  same for a neutral atom
• The electron cloud will have different energy
  levels. The electrons in each level will have a
  different amount of energy.

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Atoms Combine
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Atoms Combine
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Atoms Combine
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Atoms Combine

• The closer the electron is to the nucleus, the
  stronger the attractive force
• Electrons on the highest level have the greatest
  energy
• Electron Dot Diagram chemical symbol and the
  number of electrons on the outer most shell
• Chemical bond force that holds two elements
  together.

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Atoms Combine

• Noble Gases most stable element group, least
  reactive, inert gases
• Halogens reactive elements in group 17.
  Ability to gain an electron and form a bond makes
  it reactive. Fluorine is more reactive than
  Bromine because their valence electrons are
  closer to the nucleus.
• Alkali Metals reactive elements in group 1.
  More reactive as you go down the group.

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Atoms Combine
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Lewis Dot Structure

1. Look at the group number
2. That tells you how many electrons there are on
   the outer shell.
3. Place the electrons in a box fashion in a counter
   clockwise circle.

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Lewis Dot Structure

• 1. Look at the group number

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Lewis Dot Structure

• 2. That tells you how many electrons there are
  on the outer shell.

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Lewis Dot Structure

• 3. Place the electrons in a box fashion in a
  counter clockwise circle.