CALCIUM SULFIDE

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" height=30 BGCOLOR="#006699" TEXT="#080000"> <div> <FONT SIZE="2" COLOR="#FFFFFF" FACE="Arial" ><B>CHEMISTRY SCHOOL</B></FONT><FONT SIZE="2" COLOR="#FFFFCC" FACE="Arial" >  </FONT><A HREF="index.htm" TARGET="_top" TITLE="CHEMISTRY SCHOOL"><U>HOME PAGE </U></A>     <A HREF="inorganic_chemistry.htm" TARGET="_top" TITLE="INORGANIC CHEMISTRY"><U>TO THE INDEX OF INORGANIC COMPOUNDS</U></A><A HREF="inorganic_chemistry.htm" TARGET="_top" TITLE="INORGANIC CHEMISTRY"><U> </U></A>   <FONT SIZE="1" COLOR="#FFFFCC" FACE="Arial" > </FONT><FONT SIZE="1" COLOR="#DDDDDD" FACE="Arial" >CALCIUM SULFIDE</FONT><FONT SIZE="1" COLOR="#FFFFCC" FACE="Arial" > </FONT>= CALCION SULFIDE </div> <bR> <div> </div> </td> </tr><tr> <td valign="top" height=450 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> <B> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="1" WIDTH="761" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" ALIGN="BOTTOM" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 891 ><NOBR><div>   <IMG SRC="1169d55a0.gif" border=0 width="213" height="346" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <B>            CALCIUM SULFIDE</B></div> <div> <B>            20*( 4.CLC + 4.SLF )</B></div> <div> <B>    CLC: ••2                        SLF:•• 2</B></div> <div> <B>    Ø =3.94u                   Ø = 2.08u</B></div> <div>   <FONT SIZE="1" COLOR="#660000" FACE="Arial" >CALCIUM SULFIDE, IS A MINERAL WITH,</FONT></div> <div>   A SOFT YELLOW-WHITE,CUBIC CRYSTAL</div> <div>   IT IS FOUND IN  AUSTRALIA, TASMANIA</div> <div>   SOUTHERN ASIA AND NEW ZEALAND.</div> <div>   IT IS USED IN </div> <div>   HOSPITAL FABRICS</div> <div>   FIBERGLAS RESINS </div> <div>   POLYSEAMSEAL SEALANTS,</div> <div> .  </div> <div>  <FONT SIZE="2" COLOR="#660000" FACE="Arial" >  </FONT> Density = 2.496 grams / cu'cm</div> <div>     Weight = 20(479<B>.</B>184) ugr</div> <div>     Weight =  9,583<B>.</B>680 ugr       </div> <div>     Dissolves = 38°C </div> <div>     Hardness  =  228 durons</div> <div>     Ø = The atoms diameter</div> <div>     1u =<B>.</B>000'000'1millimeters</div> <div> <FONT SIZE="1" COLOR="#990000" FACE="Arial" >    </FONT>1ugr = 10e-24 grams =1<B>.</B>66amu</div> </NOBR></tD> <tD VALIGN=TOP><NOBR><div> <B>CALCIUM SULFIDE                                CaS ??</B></div> <div> MINERALS, CONTAINING THE ALKALINE METALINES,</div> <div> ARE ALMOST IMPOSSIBLE, TO MAKE LEED STUDYS OF, </div> <div> BECAUSE,THE ELECTRONS, SEEM TO BE ATTRACTED,</div> <div> ONLY TO THE ALKALINE METALINES, AS CHEM-DATA</div> <div> DISCOVERED, WHEN STUDYING 20 EQUAL STUDYS, </div> <div> OF CALCIUM MONO-SULFIDE, MADE BY IUPAC STAFF</div> <div> AT CAMBRIDGE UNIVERSITY, IN THE 1950's.</div> <div> USING DATA, FROM THE RECENTLY PUBLISHED,</div> <div> TABLE OF THE SIZES OF THE ATOMIC ELEMENTS </div> <div> THE CHEM-DATA TEAM, THEN DREW CIRCLES, </div> <div> THE SIZE OF CO-VALENT BONDED, CALCIUM ATOMS, </div> <div> AROUND ALL OF THE ELECTRON HITS, ON THE NUCLEI, </div> <div> OF THE CALCIUM ATOMS, IN THE 20 IUPAC STUDYS, </div> <div> THEY FOUND, THAT THE SPACES, BETWEEN THEM,</div> <div> <FONT SIZE="1" COLOR="#660033" FACE="Arial" >WERE,THE SIZE OF THE DIAMETER OF</FONT> <B><U>CO-VALENT </U></B></div> <div> BONDED, SULFUR ATOMS, AS SHOWN RIGHT.</div> <div> THEN,THEY ADDED,THE SMALLER, YELLOW CIRCLES, </div> <div> BETWEEN,THE CALCIUM ATOM HITS, AS SHOWN RIGHT </div> <div> AND THE FORM OF THE CUBIC CRYSTAL </div> <div> THAT IS REFERRED TO IN  CHEMISTRY BOOKS </div> <div> BECAME MORE POSSIBLE TO COMPREHEND.</div> <div> COMPUTERS, SOON CREATED AN EXACT REPLICA OF, </div> <div> ONE SIDE OF A CUBIC CRYSTAL OF CALCIUM SULFIDE,</div> <div> AS YOU SEE BELOW-RIGHT, AND A FEW DAYS LATER,</div> <div> THE LARGE MODEL, ON THE LEFT, WAS COMPLETED,</div> <div> SO THAT IUPAC COULD REVISE THE CaS FORMULA</div> <div> TO REFLECT ITS NATURAL SHAPE,TO <FONT SIZE="1" COLOR="#CC0033" FACE="Arial" ><B>80 (CaS) </B></FONT></div> <div> AAGE BOHR, STUDIED THE BONDS, BETWEEN THE,</div> <div> PAIRED CALCIUM ATOMS, NEXT TO THE CENTER LINES,</div> <div> IN THE CUBIC CRYSTALS AND FOUND THEM ALL TO BE,</div> <div> STILLED ORBITAL...SHARED CO-VALENT BONDS OF,</div> <div> THE ELECTRONS. IN THE OUTER. "P" <U>P</U>ERPENDICULAR<U>,</U></div> <div> ORBITALS, WHICH IS WHY CALCIUM SULFIDE IS CUBIC.</div> </NOBR></tD> <tD VALIGN=TOP WIDTH="166"><div> <B><IMG SRC="117892920.gif" border=0 width="146" height="146" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> <div>        A <A HREF="#leed_studys" TITLE="CALCIUM SULFIDE"><U>LEED STUDY </U></A>OF</div> <div>    A FROZEN CRYSTAL OF </div> <div> CALCIUM "MONO"SULFIDE</div> <div> <IMG SRC="1179938e0.gif" border=0 width="147" height="142" ALIGN="BOTTOM" HSPACE="0" VSPACE="0">THE LEED STUDY WITH </div> <div> LARGE CIRCLES, DRAWN </div> <div> AROUND THE HITS ON</div> <div> EACH NUCLEUS  OF THE</div> <div> CALCIUM ATOMS AND</div> <div> SMALLER ONES, PLACED </div> <div> WHERE THE SULFUR ION</div> <div> ATOMS, WERE DETERMINED</div> <div> TO BE, BETWEEN THEM.</div> <div> <B><IMG SRC="117a99900.gif" border=0 width="153" height="144" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> <div> THE SMALL CIRCLES SHOW</div> <div> THE LOCATIONS OF THE</div> <div> SULFUR ION-ATOMS</div> <div> <B><IMG SRC="117b9b960.gif" border=0 width="155" height="150" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> </tD> </tR> </TABLE></B></div> <DIV ALIGN="LEFT"></DIV> <div>  <A NAME="leed_studys"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="1" ALIGN="bottom" WIDTH="1" HSPACE="0" VSPACE="0" ></A></div> <div> <B>LEED</B> STUDYS ARE <B>L</B>OW<B> E</B>NERGY <B>E</B>LECTRON <B>D</B>IFFRACTION STUDYS,</div> <div> THAT DISPLAY THE LOCATION OF THE NUCLEI OF THE ATOMS OR IONS,</div> <div> AS A RESULT, OF ELECTRONS, HITTING THE NUCLEI, IN MANY, SUCCESSIVE PASSES</div> <div> OVER THE  INORGANIC COMPOUNDS & CRYSTALS.OR FROZEN ORGANIC MOLECULES</div> <bR> <div> <A HREF="calcion_sulfide_m.htm" TITLE="CALCIUM SULFIDE"><U>BACK TO TOP</U></A></div> </td> </tr></table></body>