Does anyone know any jokes about sodium?
Na
Tell me a potassium joke!
K
Cats are composed of iron, lithium and neon… or FeLiNe
What do you do when a chemist dies?
You Barium!
BONUS geeky joke:
I wanted to make a joke about chemistry, but the best ones are argon
See the original joke at http://cqhub.co/Wy50
jokeindex 
Absolutely awful……I love them!