As an ion chromatography chemist I made this one up:
Anions aren't negative, they're just misunderstood.
1918
1
Q: What did the scientist say when he found 2 isotopes of helium?
A: HeHe
979
0
A proton and a neutron are walking down the street.
The proton says, "Wait, I dropped an electron help me look for it."
The neutron says "Are you sure?"
The proton replies "I'm positive."
2280
3
Q: Did you hear oxygen went on a date with potassium?
A: It went OK.
1344
0
Q: What is the chemical formula for "banana"?
A: BaNa2