•It's hard to explain puns to a kleptomaniac because they always take things literally.
•Pencils could be made with erasers at both ends, but what would be the point?
•How do you tell a male chromosome from a female chromosome?
—You pull down its genes.
•I would tell some science jokes, but all the good ones argon.
•When I found out Oxygen and Magnesium were dating, I was like, "OMg!"
•I would tell a chemistry joke, but I would probably get no reaction.
•I need 11 protons because I'm sodium fine.
•I was going to tell you a chemistry joke, but I would probably get no reaction.
•I was going to tell you a joke about sodium hydride, but I thought, "NaH."
•Two atoms are walking down the street. One atom exclaims, "Oh no! I lost an electron!"
—The other asks, "Are you sure?"
—"I'm positive."