Last two are awesome
Another two that I'm sure is a repost
Two atoms are walking down the street. Suddenly one of them stops and starts checking his pockets.
"Hang on a second, I think I've lost an electron."
"Are you sure?"
"Yeah, I'm positive!"
Harharhar.
The other one is a poem.
Willie was a chemist
But willie is no more
What Willie thought was H2O
Was H2SO4