What element has the symbol 'Y'?

The story behind the answer

Y is the chemical symbol for yttrium (atomic number 39). Don’t confuse it with ytterbium, whose symbol is Yb; and “Yellowium” isn’t an element. So the correct choice is Yttrium.

Yttrium is one of several “rare-earth” elements named after Ytterby, a Swedish village that also lent its name to ytterbium (Yb), terbium (Tb), and erbium (Er). It’s used in red phosphors for CRTs and LEDs, in YAG lasers (yttrium aluminum garnet), and in strong ceramic materials. Memory tip: plain Y goes with plain yttrium; if you see a “b” in the symbol (Yb), think ytterBium.