CHEMystery: The Periodic Table of the Elements

<BODY BGCOLOR=#000000 TEXT=#FFFFFF LINK=#FF7F00 VLINK=#00CFCF ALINK=#FFFF00> <B><SMALL> <A HREF=".." TARGET="_parent">Return</A> to the Main CHEMystery Page.<BR> <A HREF="../pertable" TARGET="_parent">Return</A> to the Periodic Table of the Elements<BR> </SMALL></B> <H1><FONT FACE="Arial"><I>Element 1 - Hydrogen (H) <A HREF="1.wav"><IMG SRC="sound.gif" ALT="sound" BORDER=0 ALIGN=top></A></I></FONT></H1> From <I>hydor</I> and gen, or water-forming; discovered 1766 by Henry Cavendish; the lightest element Hydrogen is almost never found free on earth, but the sun and other stars are almost pure hydrogen. The thermonuclear fusion of hydrogen nuclei therefore lights and heats the universe. <HR> <CENTER><TABLE BORDER=1 CELLPADDING=2 CELLSPACING=2> <TR><TD COLSPAN=2><CENTER><H3><FONT FACE="Arial">Properties</FONT></H3></CENTER></TD></TR> <TR> <TD><A HREF="../reference/glossary.html#atomicnumber" TARGET="_parent">Atomic Number</A>:</TD> <TD>1<BR></TD> </TR> <TR> <TD><A HREF="../reference/glossary.html#atomicweight" TARGET="_parent">Atomic Weight</A>:</TD> <TD>1.00794<BR></TD> </TR> <TR> <TD><A HREF="../reference/glossary.html#electronconfiguration" TARGET="_parent">Electron Configuration</A> (at ground state):</TD> <TD>1s<SUP>1</SUP><BR></TD> </TR> <TR> <TD><A HREF="../reference/glossary.html#oxidationstate" TARGET="_parent">Oxidation States</A> (Bold most stable):</TD> <TD><B>+1</B>, -1<BR></TD> </TR> <TR> <TD><A HREF="../reference/glossary.html#boilingpoint" TARGET="_parent">Boiling Point</A> (K):</TD> <TD>20.28<BR></TD> </TR> <TR> <TD>Melting Point (K):</TD> <TD>13.81<BR></TD> </TR> <TR> <TD><A HREF="../reference/glossary.html#density" TARGET="_parent">Density</A> (at <A HREF="../reference/glossary.html#standardconditionsoftemperatureandpressure" TARGET="_parent">STP</A> -- g/l):</TD> <TD>0.0899<BR></TD> </TR> <TR> <TD>Atomic Volume (liquid state at boiling point -- cm<SUP>3</SUP>/mol) <TD>14.10<BR></TD> </TR> <TR> <TD>Number of stable <A HREF="../reference/glossary.html#isotopes" TARGET="_parent">isotopes</A>:</TD> <TD>2<BR></TD> </TR> <TR> <TD>Number of natural <A HREF="../reference/glossary.html#radioactivity" TARGET="_parent">radioactive</A> isotopes:</TD> <TD>1<BR></TD> </TR> <TR> <TD> <A HREF="../reference/glossary.html#massnumber" TARGET="_parent">Mass Number</A> (Bold naturally occurring) -- <A HREF="../reference/glossary.html#halflife" TARGET="_parent">Half-Life</A> -- <A HREF="../reference/glossary.html#radioactivedisintegrationseries" TARGET="_parent">Disintigration Type</A>: </TD> <TD> <B>3</B> -- 12.26 years -- <A HREF="../reference/glossary.html#betaparticle" TARGET="_parent">beta particle</A> (<A HREF="../reference/glossary.html#electron" TARGET="_parent">electron</A>) emission<BR> </TD> </TR> <TR> <TD>Covalent Radius (Å):</TD> <TD>0.32<BR></TD> </TR> <TR> <TD>Atomic Radius (Å):</TD> <TD>2.08<BR></TD> </TR> <TR> <TD>First <A HREF="../reference/glossary.html#ionizationenergy" TARGET="_parent">Ionization Potential</A> (V):</TD> <TD>13.598<BR></TD> </TR> <TR> <TD><A HREF="../reference/glossary.html#electronegativity" TARGET="_parent">Electronegativity</A> (Pauling's):</TD> <TD>2.10<BR></TD> </TR> <TR> <TD><A HREF="../reference/glossary.html#specificheat" TARGET="_parent">Specific Heat</A> Capacity (at 300K -- J g<SUP>-1</SUP> K<SUP>-1</SUP>):</TD> <TD>14.304<BR></TD> </TR> <TR> <TD>Heat of Vaporization (kJ/mol):</TD> <TD>0.4581<BR></TD> </TR> <TR> <TD>Heat of Fusion (kJ/mol):</TD> <TD>0.0585<BR></TD> </TR> <TR> <TD>Thermal Conductivity (at 300K -- W m<SUP>-1</SUP> K<SUP>-1</SUP>):</TD> <TD>0.1815<BR></TD> </TR> <TR> <TD>Crystal Structure:</TD> <TD><IMG SRC="hexagonal.gif" ALIGN=middle> Hexagonal<BR></TD> </TR> <TR> <TD><A HREF="../reference/glossary.html#acid" TARGET="_parent">Acid</A>-<A HREF="../reference/glossary.html#base" TARGET="_parent">Base</A> Properties (for representative oxides):</TD> <TD><IMG SRC="amphoteric.gif" ALIGN=middle> <A HREF="../reference/glossary.html#amphotericoxide" TARGET="_parent">Amphoteric</A><BR></TD> </TR> </TABLE></CENTER> <HR> <CENTER> <A HREF="ptbl_bar.map"><IMG SRC="ptbl_bar.gif" ALT="The Periodic Table of the Elements" BORDER=0 WIDTH=579 HEIGHT=49 ISMAP></A> </CENTER> </BODY>