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<p>containing ligating atoms that are the lightest of their Periodic Group", and a <b>class (b) metal ion</b> as one "that combines preferentially with ligands containing ligating atoms other than the lightest of their Periodic Group."</p>

<p><big>See also</big></p>
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*<a href="page.php?w=HSAB_theory">HSAB theory</a>, hard and soft (Lewis) acids and bases</p>

<p><big>References</big></p>
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