<p>Hey guys,</p>
<p>I am taking the chem test tomorrow, so please help! :)</p>
<li><p>Why does Silicon have unpaired electrons. and what does " unpaired e" mean?</p></li>
<li><p>Can anyone explain a little bit about s-s, s-p,bonds etc, ?</p></li>
</ol>
<p>appreciate </p>
<p>:)</p>
<p>Unpaired electrons - draw the electronic configuration , i.e. put all the electrons in orbitals using hunds rule and you'll see (refer to a book if you don't know how to do it.... it should be in the chapter atomic structure or something like that)</p>
<p>As far as i know for SAT you don't need to konw much about s-s s-p bonds etc.</p>
<p>o, really?</p>
<p>but i saw the s-p, s-s bonds in the old real SATs?</p>
<p>you mean they made some changes?</p>
<p>thanks, though. :) badman89</p>
<p>anyone else?</p>
<p>yeah the paired and unpaired electrons have to do with Hund's rule after filling them in. Those that do not have of their electrons paired are known as paramagnetic while those that do have all their electrons paired (including noble gases but not limited to) are diamagnetic. With sp, that has to do with hybridization or the hybrid orbitals with variation sin standard shape which depends on the number of bonded pairs and lone pairs. For example, if an atom has two electron pairs, it has sp bond or hybridization. </p>
<p>Sp^2--Trigonal planar with three electron pairs<br>
Sp^3--Tetrahedral, four electon pairs
dsp^3--Trigonal bipyramidal, five pairs
d^2sp^3--Octahdral, six pairs</p>
<p>That's pretty much it for hybridization if that's what you were talking about.</p>
<p>thanks so myuch romeaugustus !!!!!</p>
<p>appreciate... :)</p>
<p>but, is there a p-p bond?</p>
<p>i mean</p>
<p>according to the questions in the real SAT book</p>
<p>it says
H2 has an s-s bond<br>
HF has an s-p bond
F2 has a p-p bond</p>
<p>does the "s" or "p" indicates the subshell?</p>
<p>thanks so mcuh if anyone can explain this to me...... :)</p>
<p>You probably know that F has valance electrons in its third energy level, right? meaning 7 electrons---2 in 3s and and 5 in the 3p orbitals. You also probably know that F need one more electron to form a stable octet.
When an F atom binds to another F atom the share one a pair of electrons--one each from their 3p subshells. That's why they form p-p bonds. (one 3p electron with another 3p electron)</p>
<p>sorry misspelled valence</p>
<p>yeah, thats what i thought.</p>
<p>thanks jh12000 :)</p>