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<a accesskey="1" href="page.php?w=VSEPR_theory&amp;p=3">1.Previous</a><br />
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<p>the <a href="page.php?w=electron_localization_function">electron localization function</a> (ELF) and the <a href="page.php?w=atoms_in_molecules">quantum theory of atoms in molecules</a> (AIM or QTAIM).</p>

<p><big>History</big></p>
<p>The idea of a correlation between molecular geometry and number of valence electron pairs (both shared and unshared pairs) was originally proposed in 1939 by <a href="page.php?w=Ryutaro_Tsuchida">Ryutaro Tsuchida</a> in Japan, and was independently presented in a <a href="page.php?w=Bakerian_Lecture">Bakerian Lecture</a> in</p><p>
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