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<p>molecular orbital, is defined by the presence of an additional nodal plane between these two bonded atoms.</p>

<p><big> Multiple bonds </big></p>
<p>A typical <a href="page.php?w=double_bond">double bond</a> consists of one sigma bond and one pi bond; for example, the C=C double bond in <a href="page.php?w=ethylene">ethylene</a> (H<sub>2</sub>C=CH<sub>2</sub>). A typical <a href="page.php?w=triple_bond">triple bond</a>, for example in <a href="page.php?w=acetylene">acetylene</a> (HC?CH), consists of one sigma bond and two pi bonds in two mutually perpendicular</p><p>
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