<HTML>
<HEAD>
   <TITLE>einsteinium</TITLE>
<script type="text/javascript">

  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', 'UA-30418151-1']);
  _gaq.push(['_trackPageview']);

  (function() {
    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();

</script>
</HEAD>
<BODY BGCOLOR="#FFFFFF">

<CENTER><P><IMG SRC="spec500.gif" 
ALT="SPECTRUM" HEIGHT=84 WIDTH=500 ALIGN=BOTTOM>
<BR>
</P></CENTER>

<CENTER><P><B><FONT SIZE=+2>Chemical Fact 
Sheet</FONT></B></P></CENTER>

<CENTER><P><B><FONT SIZE=+3>Einsteinium</FONT></B></P></CENTER>

<CENTER>
<TABLE BORDER=1 WIDTH="100%" >
<CAPTION></CAPTION>

<TR>
<TH>Chemical Abstract Number (CAS #)</TH>

<TD>
<FONT SIZE=-1>7429-94-4</FONT></TD>
</TR>

<TR>
<TH>Analytical Methods</TH>

<TD><FONT SIZE=-1>200.8 - 
6020</FONT></TD>
</TR>

<TR>
<TH>Atomic Symbol</TH>

<TD><FONT SIZE=-1>Es</FONT></TD>
</TR>

<TR>
<TD>

<CENTER><P><B>Synopsis from the<A HREF="http://www.crcpress.com">
 CRC Handbook of Chemistry and Physics 
92nd Edition 2011-2013</a></B></P></CENTER>

<CENTER><P><A HREF="http://www.crcpress.com">
<IMG SRC="crcbook.jpg" HEIGHT=203 WIDTH=144></A></P></CENTER>
</TD>


<TD><FONT SIZE=-1>Einsteinium — (Albert Einstein [1879–1955]), 
Es; at. wt. (252);
m.p. 860 °C (est.); at. no. 99. Einsteinium, the seventh tran-
The Elements 4-11
suranic element of the actinide series to be discovered, was
identified by Ghiorso and co-workers at Berkeley in December
1952 in debris from the first large thermonuclear explosion,
which took place in the Pacific in November 1952. The isotope
produced was the 20-day 253Es isotope. In 1961, a sufficient
amount of einsteinium was produced to permit separation of
a macroscopic amount of 253Es. This sample weighed about
0.01 μg. A special magnetic-type balance was used in making
this determination. 253Es so produced was used to produce
mendelevium. About 3 μg of einsteinium has been produced
at Oak Ridge National Laboratories by irradiating for several
years kilogram quantities of 239Pu in a reactor to produce 242Pu.
This was then fabricated into pellets of plutonium oxide and
aluminum powder, and loaded into target rods for an initial
1-year irradiation at the Savannah River Plant, followed by
irradiation in a HFIR (High Flux Isotopic Reactor). After 4
months in the HFIR the targets were removed for chemical
separation of the einsteinium from californium. Nineteen isotopes
and isomers of einsteinium are now recognized. 254Es
has the longest half-life (276 days). Tracer studies using 253Es
show that einsteinium has chemical properties typical of a
heavy trivalent, actinide element. Einsteinium is extremely radioactive.
Great care must be taken when handling it.</FONT></TD>
</TR>
</TABLE></CENTER>

<CENTER><P><BR>
<B><A HREF="http://www.speclab.com/compound/disclaim.htm">DISCLAIMER -
Please Read</A><br><br>
<br><center><INPUT TYPE = "button" VALUE= "Return to Previous Page" OnClick="history.go(-1); return true;"></form>
<br><br>
<table><tr>
          <td align="center" rowspan="2"> <IMG SRC="/FEnew.jpg" height = "168" width="302""> </td>
          <td align="center" font size = "2"><A HREF="http://www.flenviro.com/fsestemp7.html">Florida-Spectrum List of Services</A></TD></TR>
   
       <tr>
          <TD align="center"><A HREF="http://www.flenviro.com">Florida-Spectrum Homepage</A></TD></TR></TABLE></CENTER>
�