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<p>there is a separation of positive and negative charges. </p>

<p>The bond dipole <a href="page.php?w=u">u</a> is given by:</p>

<p>
:.</p>

<p>The bond dipole is modeled as ?<sup>+</sup>&nbsp;&mdash;&nbsp;?<sup>-</sup> with a distance d between the <a href="page.php?w=partial_charges">partial charges</a> ?<sup>+</sup> and ?<sup>-</sup>. It is a vector,  parallel to the bond axis, pointing from minus to plus, as is conventional for <a href="page.php?w=electric_dipole_moment">electric dipole moment</a> vectors.</p>

<p>Chemists often draw the vector</p><p>
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