Ch 6.3 bond structures

Ch 6.3 bond structures - Guidelines for Writing Lewis...

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Chapter 6 54 Guidelines for Writing Lewis Structures 3. Count how many electrons we would need for a full octet on each atom with no multiple bonds. 4. Subtract number 2 from number 3 and divide by 2. If positive, this is the number of multiple bonds. If negative, this is number of extra lone pairs on central atom. 5. Fill in the bonds and lone pairs to give full octets. 1. Determine the Central Atom. Least electronegative. 2. Count how many electrons we have. If polyatomic ion: Add electron for each negative charge, subtract an electron for each positive charge. 3. Form a single bond between all connected atoms. 4. Assign remaining electrons as lone pairs to fill octets. Start with most electronegative atoms. 5. If any atoms do not have a full octet, change lone pairs to bonding pairs. 6. Check for resonance structures (if n 3 don’t forget to look for expanded octets). 7. If multiple valid Lewis structures are found, then determine best resonance structure(s) from the formal charges.
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Ch 6.3 bond structures - Guidelines for Writing Lewis...

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