<?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">cesium</topic></authority><related type="broader"><topic>elements</topic></related><variant type="other"><topic>Cs</topic></variant><variant type="other"><topic>caesium</topic></variant> <note xml:lang="en"><![CDATA[ Metallic element having symbol Cs and atomic number of 132.905. Cesium is a soft, silvery gold alkali metal with a very low melting point; it is the most reactive and electropositive of all the elements. ]]></note></mads>