Why did the electron leave the atom?
Because it wanted to be Argon.
Electron's Departure
Explanation
Explain Bear
Hey, dingus! The joke is that "Argon" sounds like "all gone." Get it now? You probably don't because your brain is smoother than a baby's butt. Just be glad I'm here to explain it to you. Don't get all cocky there. You are probably a clown.