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Reference.org
Names for sets of chemical elements
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<p>There are currently 118 known <a href="/facts/Chemical_elements/0jducgWD">chemical elements</a> with a wide range of physical and chemical properties. Amongst this diversity, scientists have found it useful to apply names for various sets of elements that have similar properties, to varying degrees. Many of these sets are formally recognized by the standards body <a href="/facts/IUPAC/2AV6myCK">IUPAC</a>. </p>