Isnt there one in the back of your book? Look at some high school chemsitry books they're bound to have one...

in year 9 all they want (to my knowledge) is 2 on the first shell, 8 on each remaining shell until you've put all the electrons on so instead of 2:8:18:8 (or whatever) you would use 2:8:8:8:8:2 at least thats how they taught me in year nine (about 3 years ago)

The above 6 or 7 posts demonstrate why Chemistry was my worst subject ;)

do you like the other sciences(pysics and biologie) though? maybe your just more of an artsy type. :D
personally its my 3rd favorite subject with maths 2nd and physics 1st [img]smile.gif[/img]

do you like the other sciences(pysics and biologie) though? maybe your just more of an artsy type. :D
personally its my 3rd favorite subject with maths 2nd and physics 1st [img]smile.gif[/img] </font>[/QUOTE]Actually, yeah - I'm a bit of a physics junkie. I did 4 A-levels - Physics, Maths, English, French. I did my degrees in Linguistics, though. If we had done a little more astronomy in Physics, however, it may have been a different story [img]smile.gif[/img]

Hope you got your homework donre Sir Goloum! WillowIX's advice is all you need at your stage, I think it's more conventional to draw the elctrons in pairs as opposed to single ones evenly spaced. (Study chemistry for another few years and you'll never see an atom the same way again, you'll also understand what Andrewas was going on about, which I don't think you do in grade 9...).

Hey Bruce the Aussie, you got the order wrong, it's Biology, Physics and then Chemistry in the oder coolest science first [img]tongue.gif[/img] Saying that, I did all of them for A-level, so I think they are all great.

Biology, blech. I once found a biology experiment in the Chemistry oven. Seems someones project involved rotting teeth and the biology dept oven was busted.

Still, I needed to dry some glassware. Carbonised Teeth :D

And then there was the milk going off at diferrent rates at different temperatures fiasco - err, experiment. Seems some first year snot (who survived our attempts to locate and dismember) decided that turning up all the temps on the way out at the end of day would be funny.

And the time some idiot turned off power to the biology department at the start of the summer holidays. 8 weeks with no power to the fridge.

Id reverse the order of the sciences. Chem rocks, physics is OK, and biology is a danger to anyone with a sense of smell.

<font color = lightgreen>Ooh! Electron configuration! [img]graemlins/awesomework.gif[/img]

There are two independent concepts here: shells and orbitals. Shells go from 1 to 7 while orbitals are classified as s (2 electrons), p (6 electrons), d (10 electrons), and f (14 electrons).

Electrons will fill into shells and orbitals in this order:
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d

A slightly more advanced investigation shows that electrons fill into the orbitals singly first, then join up to make pairs. That is, orbitals have sub-orbitals (for p, 3 orbitals in space following x-, y-, and z-axes).

Anyway, lots of good information from the posts here. [img]graemlins/petard.gif[/img] </font>

Ungh! Chem! Yuck! As an Electrical Eng, I though I was done with Chem after fresh year, only to be sideswiped Sr year with Integrated Circuits ... all chem. And you can't really separate Chem and Physics, they relate to each other too much. That said, as I remember things Willow has it right. That is for a steady state atom though (confused yet?). It gets insane for varying thermo levels. Ignore the rest of us .... follow Willow .... [img]smile.gif[/img]

It really depends on the teacher. For instance, I have a really cool Physics teacher at the moment, so I think Physics is great. But Chemistry... *sigh*
The first two years (last year and the year before) we had chemistry, we had a teacher that was simply AWFUL. No one learned a thing, they all failed the tests which were actually incredibly easy. Only a few people (me included) who learned the stuff at home managed fine. After those two years, everyone in the entire class except me and another guy who simply *loves* sciences quit chemistry. I only did it because I had an empty slot in my schedule in a very inconvenient place (sitting around for one and a half hours in the middle of the day every Tuesday isn't my idea of fun). So I chose chemistry.
This teacher is almost as bad... I swear, before every lesson I think "Is this really worth it? Do I really want to inflict this on myself only for the good grades?" I am going to quit after this half year is over.
Just to show that it's very hard to say "I like this subject best, then that, then that, then that." I generally love sciences, but I cannot stand chemistry because of these two teachers. They completely ruined it for me.