Hydrogen jokes

I’d tell a sodium and hydrogen pun, but NaH.

Two hydrogen atoms walk into a bar.

One turns to the other and says, "I think I've lost my electron."

The other asks, "Are you sure?"

"Yes," the first says, "I'm positive!"

If O2 is H2O, what is F?

It is H2O too; F is water as well.

One day, a chemistry teacher asked his student, whose name is Raj, "What is the chemical formula of water?"

The Raj replied, "HIJKLMNO."

The teacher asked, "What is this rubbish?"

The Raj replied, "Yesterday, you taught the chemical formula of water is H2O."

Q: What did the chemist say when he found two isotopes of Helium?

A: HeHe.