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Lecture 1.2 – the Octet Rule PowerPoint Presentation
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Lecture 1.2 – the Octet Rule

Lecture 1.2 – the Octet Rule

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Lecture 1.2 – the Octet Rule

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  1. Lecture 1.2 – the Octet Rule

  2. CA Standards • Students can determine the number of valence electrons for an element, draw a Lewis dot notation for an element and explain how the Octet rule leads to the formation of ions.

  3. I. VALENCE SHORTCUT! • All elements in the same group (1A, 2A, etc.) have the same number of valence electrons. • Lewis Dot Notation shows only Valence e- • Nitrogen (#7) = • Magnesium (#12) = • Sulfur (#16) = • Sodium

  4. What is the Octet Rule?

  5. II. The Octet Rule • Atoms like to have a full outer valence shell  Stable atom. • gain or lose electrons to have an outer orbit with 8 electrons (or 2 if it is the first energy level). • Gain/lose based on what is easiest.

  6. III. Octet SHORTCUT • All metals will losetheir valence electrons • All non-metals will gain the missing ones.

  7. What are the types of ions that can form?

  8. IV. Ions • When atoms gain/lose electrons, they gain a charge. • Ion– A charged atom due to unequal number of protons and electrons • Cation– A positively charged ion • Anion– A negatively charged ion

  9. E- = detention hrs.  • If you gain electrons (detention hrs.)  you become negative (sad)  • If you lose electrons (detention hrs.)  you become positive (happy) 

  10. CATION  POSITIVE Cats make people feel positive ANION  NEGATIVE

  11. Class Example • Draw dot notation for Be. Determine the ion that forms for fluorine after the Octet Rule has been satisfied.

  12. Table Talk • Draw the dot notation for Chlorine. Determine the ion that forms for nitrogen after the Octet Rule has been satisfied.

  13. Stop and Jot • Draw the dot notation for Sulfur. Determine the ion that forms for oxygen after the Octet Rule has been satisfied.

  14. Ion Shortcut! • All elements in the same group, form ions with the same charge.

  15. MOVIE