<p>Also, what do you consider the metalloids to be? I know boron, silicon, germanium, arsenic, antimony, tellurium, and polonium are on Wiki, but my teacher says that astatine counts, too. Now I’m confused. :P</p>
<p>I’m using both Barrons and Princeton Review, and I’m quickly discovering that Barrons gives you a lot of useless information…</p>
<p>Principal quantum number describes the energy state that the electron is in (the higher the number, the higher the energy state, and the further away from the nucleus).</p>
<p>I’ll get the rest for you in a second, hang on.</p>
<p>Aufbau Principle: a subshell is completely filled before electrons are placed in a higher subshell.</p>
<p>That basically means that that the a subshell will be filled completely before going onto the next subshell. For example: s |^V| needs to be filled completely before you start going to p|^V|^V|^V|.</p>
<p>Hund’s Rule of Maximum Multiplicity basically states that each individual orbital needs to be filled with one arrow before you can start pairing them. For example: p|^ |^ | ^ | must happen before you can start doing this: p|^V||^V|^V|</p>
<p>So if you use these together, and you wanted to Neon’s electron configuration (1s^2 - 2s^2 - 2p^6) you would do it in this order:</p>
<p>Thank you, Ilyana! I guess, for me, drawing the ___s for filling in the arrows would be easier to understand Hund’s Rule of Maximum Multiplicity!!</p>
<p>Hey guys- there is a section on Barrons about Representative Families and Groups (Chapter 13). Do you think we need to know everything in it? (there’s a section on making steel… I doubt they would put something THAT obscure on there, right?)</p>
<p>No problem. As long as you remember that Aufbau deals with the order of filling the energy states (s before p, p before d, etc) and Hund deals with filling arrows in each individual state (within s, within p, etc) then you’re fine. Just practice by picking out random elements and doing their configuration!</p>
<p>@girlrockingguna - I’m not sure because I haven’t gotten that far yet in my Barrons book, but Barrons does give a lot of unnecessary information, so I’m not 100% sure.</p>
<p>@Ilyana- no problem@ Let me know when you do get there.
I’m really really scared for this test… for the May takers, how hard was it? Harder than the AP test? (because that was a freaking nightmare…)</p>
<p>Found a question in Barrons that I disagree with-
The property of matter that is independent of its surrounding conditions and position is
A- volume
B- density
C- mass
D- weight
E- state</p>
<p>Barrons says it is C, I say B. Are we both right?</p>
<p>pretty sure the density of something like air can change with surrounding conditions (like temperature change - pv=nrt - would change the volume, and therefore the density)
so B would be incorrect, I think.</p>
<p>Volume is dependent on pressure, moles of a gas, and temperature… and since density is mass over volume, it can be adjusted by outside surroundings.</p>
<p>that is a very obscure question…i don’t think it’s gonna appear on the test.</p>
<p>after 5 min of thinking, i agree with Barrons. Density could be changed by surroundings. look at water, at 4C it’s 1, and as temp goes up and down, the density lowers.</p>
<p>mass is a topic introduced in physics…mass of an object never changes.</p>
<p>I haven’t studied at all for this test though i was in AP chem and i def got a 5 on that AP test. This test covers a lot of conceptual material, as opposed to computational, so study up on definitions and properties.</p>
As long as you remember that Aufbau deals with the order of filling the energy states (s before p, p before d, etc) and Hund deals with filling arrows in each individual state (within s, within p, etc) then you’re fine. Just practice by picking out random elements and doing their configuration!</p>
Have you guys heard of Khan Academy? It helped me master the basics.</p>