8is Enough

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8is Enough

  1. 1. Eight is Enough Living By Chemistry Unit: Smells Investigation II – Lesson 4
  2. 2. What do you think? <ul><li>Draw the Lewis dot structure for the following covalently bonded molecule. Explain how you arrived at your answer. </li></ul><ul><li>Cl 2 </li></ul>
  3. 3. What do you think?
  4. 4. Eight is Enough
  5. 5. Eight is Enough #3
  6. 6. Eight is Enough #5&6
  7. 7. If you finish early…
  8. 8. The Octet Rule <ul><li>Atoms of most elements are very reactive . The become stable when they combine with other atoms to form compounds. </li></ul><ul><li>The octet rule states that atoms tend to form bonds by sharing valence electrons until eight valence electrons surround each atom. </li></ul><ul><ul><li>Example: oxygen tries to “become like” neon. </li></ul></ul><ul><ul><li>Exceptions: Hydrogen and Helium </li></ul></ul>
  9. 9. Check-In <ul><li>Which of the following formulas satisfy the HONC rule? </li></ul><ul><li>Which of the following formulas satisfy the octet rule? </li></ul><ul><li>Which of the following formulas represent stable compounds we might fight in the world around us? </li></ul><ul><li>a) CH 3 b) CH 4 </li></ul>
  10. 10. Wrap-Up <ul><li>Elements form bonds by sharing electrons. </li></ul><ul><li>Atoms form bonds until they have the same number of valence electrons as the noble gas in the same row of the periodic table </li></ul><ul><li>This is called the octet rule. </li></ul>

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