CHEM 1A Lecture Notes - Lecture 20: Bond Order, Electronegativity, Formal Charge
16 May 2019
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CHEM 109A 5/15/19
Aleks due
● Lewis structures
○ Shows valence e- in a molecule or ion
○ To draw:
1) Skeletal structure
a) H on outside
b) Put Electronegative elements outside
c) Draw symmetric molecules
2) Count valence electrons
3) Distribute e- to make octets (except H)
4) If needed, make multiple bonds
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● Nitrate ion and resonance
○ Resonance structures shift e-’s
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○ Actual structure is the average of all contributors
● Bond order
○ Bond order = # bonds / # structures
○ ex) 4/3 = 1.3
