Fred's, (Used to be Barb's), Board

A molecule of Helium floated into a bar, and the bartender right away said, "Hey! We don't serve noble gasses in here!" but the Helium didn't react.

chemistry was never my strong point

Helium and the other noble gases all have their outer electron shells completely filled with electrons, and so they cannot form electronic bonds with other atoms. The don't react chemically. You never hear of Helium oxide, for instance. It cannot exist. So Helium doesn't react. (;-))

ok now I get it, thanks Fred

Two bacteria walk into a bar. The bartender says, "Hey, we don't serve bacteria here." The bacteria say, "It OK. We're Staph." (staff?).