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mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">elements</topic></authority><related type="narrower"><topic>iron</topic></related><related type="narrower"><topic>aluminum</topic></related><related type="narrower"><topic>antimony</topic></related><related type="narrower"><topic>cadmium</topic></related><related type="narrower"><topic>chromium</topic></related><related type="narrower"><topic>copper</topic></related><related type="narrower"><topic>gold</topic></related><related type="narrower"><topic>lead</topic></related><related type="narrower"><topic>magnesium</topic></related><related type="narrower"><topic>manganese</topic></related><related type="narrower"><topic>mercury</topic></related><related type="narrower"><topic>nickel</topic></related><related type="narrower"><topic>silver</topic></related><related type="narrower"><topic>palladium</topic></related><related type="narrower"><topic>platinum</topic></related><related type="narrower"><topic>titanium</topic></related><related type="narrower"><topic>tungsten</topic></related><related type="narrower"><topic>uranium</topic></related><related type="narrower"><topic>vanadium</topic></related><related type="narrower"><topic>zinc</topic></related><related type="narrower"><topic>sulfur</topic></related><related type="narrower"><topic>silicon</topic></related><related type="narrower"><topic>argon</topic></related><related type="narrower"><topic>tin</topic></related><related type="narrower"><topic>selenium</topic></related><related type="narrower"><topic>neon</topic></related><related type="narrower"><topic>phosphorus</topic></related><related type="narrower"><topic>potassium</topic></related><related type="narrower"><topic>arsenic</topic></related><related type="narrower"><topic>cobalt</topic></related><related type="narrower"><topic>trace elements</topic></related><related type="narrower"><topic>boron</topic></related><related type="narrower"><topic>calcium</topic></related><related type="narrower"><topic>chlorine</topic></related><related type="narrower"><topic>carbon</topic></related><related type="narrower"><topic>sodium</topic></related><related type="narrower"><topic>nitrogen</topic></related><related type="narrower"><topic>strontium</topic></related><related type="narrower"><topic>bismuth</topic></related><related type="narrower"><topic>thorium</topic></related><related type="narrower"><topic>zirconium</topic></related><related type="narrower"><topic>molybdenum</topic></related><related type="narrower"><topic>iridium</topic></related><related type="narrower"><topic>rubidium</topic></related><related type="narrower"><topic>lithium</topic></related><related type="narrower"><topic>rare earth elements</topic></related><related type="narrower"><topic>iodine</topic></related><related type="narrower"><topic>germanium</topic></related><related type="narrower"><topic>niobium</topic></related><related type="narrower"><topic>californium</topic></related><related type="narrower"><topic>xenon</topic></related><related type="narrower"><topic>ytterbium</topic></related><related type="narrower"><topic>cerium</topic></related><related type="narrower"><topic>cesium</topic></related><related type="narrower"><topic>radon</topic></related><related type="narrower"><topic>bromine</topic></related><related type="narrower"><topic>gallium</topic></related><related type="narrower"><topic>neodymium</topic></related><related type="narrower"><topic>fluorine</topic></related><related type="narrower"><topic>seaborgium</topic></related><related type="narrower"><topic>radium</topic></related><related type="narrower"><topic>rhodium</topic></related><related type="other"><topic>periodic table</topic></related><related type="broader"><topic>materials by chemical form</topic></related><variant type="other"><topic>chemical elements</topic></variant><variant type="other"><topic>element</topic></variant><variant type="other"><topic>elements, chemical</topic></variant> <note xml:lang="en"><![CDATA[ Simple chemical substances composed of only one type of atom and not able to be broken down, changed, or decomposed by ordinary physical or chemical means. They are the basic chemical constituents of compounds and ultimately of all tangible matter in the universe. ]]></note></mads>