<table id="periodic_table"
summary="A few elements and
their atomic properties.">
<tgroup cols="2">
<tbody>
<row>
<entrytbl cols="2">
<colspec colnum="1" colname="hyd1"/>
<colspec colnum="2" colname="hyd2"/>
<thead>
<row>
<entry namest="hyd1" nameend="hyd2">
Hydrogen
</entry>
</row>
</thead>
<tbody>
<row>
<entry>Atomic Number:</entry>
<entry>1</entry>
</row>
<row>
<entry>Atomic Symbol:</entry>
<entry>H</entry>
</row>
<row>
<entry>Atomic Weight:</entry>
<entry>1.0079</entry>
</row>
<row>
<entry>Atomic Radius:</entry>
<entry>78 pm</entry>
</row>
<row>
<entry>Melting Point:</entry>
<entry>-259.34 C</entry>
</row>
<row>
<entry>Boiling Point:</entry>
<entry>-252.87 C</entry>
</row>
</tbody>
</entrytbl>
</row>
<row>
<entrytbl cols="2">
<colspec colnum="1" colname="lit1"/>
<colspec colnum="2" colname="lit2"/>
<thead>
<row>
<entry namest="lit1" nameend="lit2">
Lithium
</entry>
</row>
</thead>
<tbody>
<row>
<entry>Atomic Number:</entry>
<entry>3</entry>
</row>
<row>
<entry>Atomic Symbol:</entry>
<entry>Li</entry>
</row>
<row>
<entry>Atomic Weight:</entry>
<entry>6.941</entry>
</row>
<row>
<entry>Atomic Radius:</entry>
<entry>152 pm</entry>
</row>
<row>
<entry>Melting Point:</entry>
<entry>108.5 C</entry>
</row>
<row>
<entry>Boiling Point:</entry>
<entry>1342 C</entry>
</row>
</tbody>
</entrytbl>
</row>
</tbody>
</tgroup>
</table>