Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Introduction to Lewis Structures

719 views

Published on

Introduces drawing Lewis Structures

Published in: Education
  • Be the first to comment

  • Be the first to like this

Introduction to Lewis Structures

  1. 1. Lewis structures Writing Lewis structures, part 1 CC image courtesy of Hiro Sheridan on Flickr
  2. 2. Lewis Structures Lewis structures are representations of covalent molecules showing all electrons, bonding and nonbonding.
  3. 3. How to write a Lewis Structure 1. PCl3 5 + 3(7) = 26 Find the sum of valence electrons of all atoms in the polyatomic ion or molecule.  If it’s an anion, add one electron for each negative charge.  If it’s a cation, subtract one electron for each positive charge.
  4. 4. Writing Lewis Structures 2. Write the skeleton. The central atom is the least electronegative element that isn’t hydrogen. Keep track of the electrons: 26 − 6 = 20 Connect the outer atoms to it by single bonds.
  5. 5. Writing Lewis Structures 3. Fill the octets of the outer atoms. Keep track of the electrons: 26 − 6 = 20; 20 − 18 = 2 from bonds from octet LPs there are two remaining
  6. 6. Writing Lewis Structures 4. Add any leftover lone pairs to the central atom. Keep track of the electrons: 26 − 6 = 20; 20 − 18 = 2; 2 − 2 = 0 from bonds from octet LPs LP on central atom
  7. 7. Check for octets!  All atoms have an octet. The structure is done

×