A proton, an electron, & a neutron walk into a bar...
The proton orders a shot, drinks it, then takes out his wallet and pays the bartender.
The electron orders a shot, drinks it, then takes out his wallet and pays the bartender.The neutron orders a shot, drinks it, then takes out his wallet... but the bartender stops him and says,
"Wait...for you, no charge!"
Oldy but goodie...
Tom..
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First hydrogen atom says to the second "I've lost an electron". Second says "Really. Are you sure?" First replies "Yes, I'm positive."
pH!

