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<p>form onium ions when the central atom gains one more bond and becomes a positive <a href="page.php?w=cation">cation</a>.<br/>
*<a href="page.php?w=Lewis_acids">Lewis acids</a> form ''-ate'' ions when the central atom gains one more bond and becomes a negative <a href="page.php?w=anion">anion</a>.</p>

<p><big> Periodic table </big></p>
<p><big> Onium ions by group </big></p>
<p><big> <a href="page.php?w=Boron_group">Group 13</a> (boron group) onium cations </big></p>
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*<a href="page.php?w=boronium">boronium</a> cation,  (protonated <a href="page.php?w=borane">borane</a>)<br/></p><p>
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