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<p><a href="page.php?w=antibonding">antibonding</a>, or ?* orbital, is defined by the presence of one nodal plane between the two bonded atoms.</p>

<p>Sigma bonds are the strongest type of covalent bonds due to the direct overlap of orbitals, and the <a href="page.php?w=electron">electron</a>s in these bonds are sometimes referred to as sigma electrons.</p>

<p>The symbol ? is the Greek letter <a href="page.php?w=sigma">sigma</a>. When viewed down the bond axis, a ? MO has a <a href="page.php?w=circular_symmetry">circular symmetry</a>, hence resembling</p><p>
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