Unit 8: Lewis Dot (again…)

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Presentation transcript:

Unit 8: Lewis Dot (again…) Objectives How to diagram simple lewis dot structures. How to determine double and triple bonding. Simple Exceptions to octet rule Tinyurl.com/OCHSChemH23 Words to know Valence electrons Octet Octet Rule Double Bond Triple bond Electron Group Lone Pairs

Steps to Lewis Dot 1) Count total valence electrons 2) Arrange atoms, least electronegative in middle (when applicable) 3) Connect atoms with single bond (2 electrons) 4) Distribute remaining electrons on outer atoms to fulfill octets 5) Place any remaining electrons on central atom 6) If not enough electrons make double or triple bonds Octet rule = nonmetals tends to bond to have 8 valence electrons **Hydrogen** = notable exception (just 2 electrons) Try the following H2S SiH2Cl2

Lewis Dot Double and Triple Tinyurl.com/OCHSChemH23 1) Try SiO2 2) C2F2

Octet Rule: Notable Exceptions Exceptions that have less than 8 1) BF3 (B) 2) BeCl2 (Be … just pretends it’s not a metal) Exceptions that have more than 8 1) PCl5 (P) 2) SF6 (S) 3) XeF4 (Xe)