Quote from Chandler in The One with Russ
Chandler: Hey, we're having some fun now, huh, Ross? Want to do another one? Huh, Russ? Okay, eleven letters. "Atomic element number 101," ends in "ium." Russ: Dysprosium. Ross: Ha, ha. Dysprosium? Try mendelevium. Chandler: And weenie number two has it. Unless, of course, nine-down, "Knights in White Satin" was sung by the Doody Blues.