<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">yttrium</topic></authority><related type="broader"><topic>nonferrous metal</topic></related><related type="broader"><topic>rare earth elements</topic></related><variant type="other"><topic>Y</topic></variant> <note xml:lang="en"><![CDATA[ Chemical  element having symbol Y and atomic number 39. Yttrium resembles lanthanide metals very closely and is often classified as a ‘rare earth element.' Yttrium’s most important use is for making the phosphors used in television screen displays and in LEDs. Yttrium phosphors emit a clear red light when excited by electrons. ]]></note></mads>