<TABLE CELLPADDING=3 BORDER="1"> <TR><TD ALIGN="LEFT">coord. number</TD> <TD ALIGN="LEFT">radius ratio</TD> <TD ALIGN="LEFT">exact</TD> <TD ALIGN="LEFT">geometry</TD> </TR> <TR><TD ALIGN="LEFT">2</TD> <TD ALIGN="LEFT">0.000-0.155</TD> <TD ALIGN="LEFT">0 to <IMG WIDTH="63" HEIGHT="36" ALIGN="MIDDLE" BORDER="0" SRC="http://scienceworld.wolfram.com/chemistry/cimg75.gif"></TD> <TD ALIGN="LEFT">linear</TD> </TR> <TR><TD ALIGN="LEFT">3</TD> <TD ALIGN="LEFT">0.155-0.225</TD> <TD ALIGN="LEFT"> <IMG WIDTH="63" HEIGHT="36" ALIGN="MIDDLE" BORDER="0" SRC="http://scienceworld.wolfram.com/chemistry/cimg75.gif"> to <IMG WIDTH="63" HEIGHT="36" ALIGN="MIDDLE" BORDER="0" SRC="http://scienceworld.wolfram.com/chemistry/cimg76.gif"></TD> <TD ALIGN="LEFT">trigonal planar</TD> </TR> <TR><TD ALIGN="LEFT">4</TD> <TD ALIGN="LEFT">0.225-0.414</TD> <TD ALIGN="LEFT"> <IMG WIDTH="63" HEIGHT="36" ALIGN="MIDDLE" BORDER="0" SRC="http://scienceworld.wolfram.com/chemistry/cimg76.gif"> to <IMG WIDTH="53" HEIGHT="36" ALIGN="MIDDLE" BORDER="0" SRC="http://scienceworld.wolfram.com/chemistry/cimg77.gif"></TD> <TD ALIGN="LEFT">tetrahedral</TD> </TR> <TR><TD ALIGN="LEFT">6</TD> <TD ALIGN="LEFT">0.414-0.732</TD> <TD ALIGN="LEFT"><IMG WIDTH="53" HEIGHT="36" ALIGN="MIDDLE" BORDER="0" SRC="http://scienceworld.wolfram.com/chemistry/cimg77.gif"> to <IMG WIDTH="53" HEIGHT="36" ALIGN="MIDDLE" BORDER="0" SRC="http://scienceworld.wolfram.com/chemistry/cimg78.gif"></TD> <TD ALIGN="LEFT">octahedral</TD> </TR> <TR><TD ALIGN="LEFT">8</TD> <TD ALIGN="LEFT">0.732-1.000</TD> <TD ALIGN="LEFT"><IMG WIDTH="53" HEIGHT="36" ALIGN="MIDDLE" BORDER="0" SRC="http://scienceworld.wolfram.com/chemistry/cimg78.gif"> to 1</TD> <TD ALIGN="LEFT">cubic</TD> </TR> </TABLE>
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The radius ratio limits are determined from geometry (Klein and Hurlbut 1985).