Lewis Dot Symbols/Structures

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Presentation transcript:

Lewis Dot Symbols/Structures Covalent Bond: a bond between two non-metal atoms where electrons are shared Lewis Dot Symbol: a way to represent valence electrons for an atom The order for drawing a Lewis Dot Symbol: (think “box”)

Lewis Dot Symbols/Structures NOTE!: to find out how many “dots” an element will have, figure out the number of valence electrons it has Example: Nitrogen has 5 va e-  should have 5 dots Oxygen Neon Nitrogen Fluorine Boron Hydrogen Beryllium Carbon

Lewis Dot Symbols/Structures lone pair – does not bond unpaired electron – forms a bond

Lewis Dot Symbols/Structures Octet Rule: atoms tend to form bonds by sharing valence electrons until eight valence electrons surround each atom EXCEPTIONS! - Hydrogen, Helium, and Boron Hydrogen – 2 total valence electrons Helium – 2 total valence electrons Boron – 6 total valence electrons

Lewis Dot Structures Practice Copy down the following molecular formulas and draw the correct Lewis Dot Structure for each. 1. HCl 2. CH4 3. H2O 4. BH3 5. NF3 6. F2O 7. NH3 8. BF3 9. CF2Cl2 10. C2H6 11. SiO2 12. CH3N 13. C2H4 14. O2 15. CO2 16. N2 17. HCN 18. CH2O2