words by Dr. James D. Livingston

tune: Comin' Through the Rye (Traditional Scottish Tune)

Click here to play tune

When an atom meets an atom
And a bond they tie
Two s waves can make a sigma
p's can make a pi
Ev'ry AO mates an AO
To an MO supply
Both s and p can make a sigma
p's can make a pi


Pi bond in ethylene

(image courtesy of Prof. Brent Iverson)

Learn more about some of the topics mentioned:
Sigma bonds, Pi bonds,
A potential application for pi-bonded materials, Original lyrics to this tune, by Robert Burns, An alternate set of lyrics to this tune by James Clerk Maxwell,

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