"tell me that joke about sodium you always tell"
why did the king fart helium
because its a noble gas
manganese jokes get any worse?
Why do chemists call 'curium', 'helium' and 'barium' the medical elements?
Because if you can't cur-ium or hel-ium, then most of the time you'll bari-um!
I wish I has a chemistry joke, but all the good ones argon.