1. Covalent Bonding Review
Still Closer? ...Nuclei repel each other. ...Higher P.E.
Potential Energy
Separation Distance
Atoms far apart? Electrons Repel... High Potential energy
Closer together? Nuclei are attracted to “SHARED ELECTRONS” Attraction = COVALENT BOND Low Potential Energy

2. Introduction to Single BondsH
Ethane C H
...or...
Single Bond
Bond Order: The number of electron pairs being shared by any pair of bonded atoms.
“ bond” (sigma bond)
...Bond Order = 1

3. Introduction to Double Bonds
...or... H H H H C C H H H H
Ethene
Double Bond contains...
1 bond
&
1 bond
...Bond Order = 2

4. Introduction to Triple Bonds
...or... H C H H C H
Ethyne
Triple Bond contains...
1 bond
2 bond
...Bond Order = 3