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Classes of metals
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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/HSAB_theory/yguwscxc">HSAB theory</a>, hard and soft (Lewis) acids and bases</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Weisstein, Eric Wolfgang (ed.). "Class A Metal". ScienceWorld. <a href="/wiki/Eric_Wolfgang_Weisstein" target="_blank">/wiki/Eric_Wolfgang_Weisstein</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Weisstein, Eric Wolfgang (ed.). "Class B Metal". ScienceWorld. <a href="/wiki/Eric_Wolfgang_Weisstein" target="_blank">/wiki/Eric_Wolfgang_Weisstein</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "class (a) metal ion". doi:10.1351/goldbook.C01094 <a href="/wiki/International_Union_of_Pure_and_Applied_Chemistry" target="_blank">/wiki/International_Union_of_Pure_and_Applied_Chemistry</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "class (b) metal ion". doi:10.1351/goldbook.C01095 <a href="/wiki/International_Union_of_Pure_and_Applied_Chemistry" target="_blank">/wiki/International_Union_of_Pure_and_Applied_Chemistry</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> </ol>