<DIV ALIGN="CENTER">
<TABLE CELLPADDING=3 BORDER="1">
<TR><TD ALIGN="LEFT">Element</TD>
<TD ALIGN="LEFT">Distribution</TD>
</TR>
<TR><TD ALIGN="LEFT">B</TD>
<TD ALIGN="LEFT">80.1% <IMG
WIDTH="18" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg87.gif">B, 19.9% <IMG
WIDTH="18" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg88.gif">B</TD> </TR>
<TR><TD ALIGN="LEFT">C</TD>
<TD ALIGN="LEFT">98.9% <IMG
WIDTH="18" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg89.gif">C, 1.1% <IMG
WIDTH="18" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg90.gif">C, 0.0% <IMG
WIDTH="18" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg91.gif">C<IMG
WIDTH="11" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg92.gif"></TD> </TR>
<TR><TD ALIGN="LEFT">H</TD>
<TD ALIGN="LEFT">99.98% <IMG
WIDTH="11" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg93.gif">H, .02% <IMG
WIDTH="11" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg94.gif">H=D, 0.00% <IMG
WIDTH="11" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg95.gif">H<IMG
WIDTH="11" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg92.gif">=T</TD> </TR>
<TR><TD ALIGN="LEFT">K</TD>
<TD ALIGN="LEFT">93.18% <IMG
WIDTH="18" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg96.gif">K, 6.82% <IMG
WIDTH="18" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg97.gif">K<IMG
WIDTH="11" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg92.gif">, 0.012% <IMG
WIDTH="18" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg98.gif">K</TD> </TR>
<TR><TD ALIGN="LEFT">U</TD>
<TD ALIGN="LEFT">99.236% <IMG
WIDTH="24" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg99.gif">U<IMG
WIDTH="11" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg92.gif">, 0.719% <IMG
WIDTH="24" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg100.gif">U<IMG
WIDTH="11" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg92.gif"></TD> </TR>
</TABLE>
</DIV>

<P>
<IMG
WIDTH="11" HEIGHT="18" ALIGN="BOTTOM" BORDER="0"
SRC="http://scienceworld.wolfram.com/chemistry/iimg92.gif">radioactive
<P>