"Chemistry song 12" joke

I Saw Teacher Kissing Santa Chlorine
I saw teacher kissing Santa Chlorine
under the chemistree last night
They didn't sneak me down the periodic chart
to take a peek
At all the atoms reacting in their beakers;
it was neat.
And I saw teacher kissing Santa Chlorine
under the chemistree so bright
Oh what a reaction there would have been
if the principal had walked in
With teacher kissing Santa Chlorine last night.