Introduction to Lewis Structures

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Information about Introduction to Lewis Structures

Published on February 23, 2014

Author: prunnels



Introduces drawing Lewis Structures

Lewis structures Writing Lewis structures, part 1 CC image courtesy of Hiro Sheridan on Flickr

Lewis Structures Lewis structures are representations of covalent molecules showing all electrons, bonding and nonbonding.

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.

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.

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

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

Check for octets!  All atoms have an octet. The structure is done

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