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Actually
I was giving Lewss a compliment about using H and I in one post.
<img src="/ubbthreads/images/graemlins/smile.gif" alt="" />

...

She never had chemistry in school...

Let's see if I can remember this...

An atom contains fo two fieldes, the (what do you call it in english???) center and the shell. The center contains of protons and neutrons. The shell contains of electrons. OK, the protona are positivelly charged (+), and the electrons are negativelly charged (-). The neutrons are neutral (neither + nor -). Pure basics this.

Now, in a substance, let's take litium, since we've allready mentioned it, there is allways a number of protons in the center. As we're talking litium there is allways 3 protons in the center. If there is more or less, it is another substance (if there is two, it's helium, if four, it's beryllium).So, the atomic number a substance is given depends on the number of protons in the center.

Now, over to the atomic weight. Now, as you know there is a WHOLE lot of litium in the universe. So, just talking about one single litiumatom isn't much worth, at least not in these kind of matters. So, lot's of litium in the world, useless to look an one atom.

And, there is difference between litium and litium. We know that the number of protons in the center don't change, but we havn't talked about the NEUTRONS (screw the electrons, theu practiclly don't have any weight anywhay. When it comes to weighting the atoms you only look at the number of protons and electrons). An atom that contains three protons and three neutrons is litium. An atom that contains three protons and four neutrons is allso litium. These are called different isotopes of litium.I don't know how many litium isotopes there are. I would guess on three or four though, and I would allso guess that litium-7 (litium with atomic weight 7, ie 3 protons and 4 neutrons) is the most common

Now let's check what atomic weight really is. It's related to mol. and what is a mol?

Mol is an invented ammount, and one mol is the number of atoms in 1/12 of 12 gram coal-12 (the most common isotope of coal, 6 protons, 6 neutrons). So, one mol coal weights one g. Or something... Anyway, the atomic weight is set so that the average of one mol substance weights it's atomic weight. So, with litium (aw=6,94), the most common one is litium-7. But there is litium-6 and probablly litium-5, so they can't just set the atomic weight to 7. So they check how much litium-7 -6 and -5 there is in the world, count the weight, cound how many mol there is, part weight with mol and comes up with the result 6,94.

Hope you understood ANYTHING of that...

Übereil

Whats the next freekin' letter!! <img src="/ubbthreads/images/graemlins/puppyeyes.gif" alt="" />

Manga(nese for the chemists here!!!)

Natron........ sodium bicarbonate .

oxygen?

Thanks Üb, for the lesson. But I've to print that one out for decifering properly. I had no chemics because I sat in a departement where you only learned the basics of Math, French, Dutch, Geography and History. For the rest we had lessons that are related to our future professions. For my, I was supposed to be a children's caretaker. Sadly enough, we can't pick our lessons like in America. I would cancel math and Geography and choose something else that's important. I'm a very lousy math and I just can remember that Dublin is the Capitol of Ireland and where Turkey lies. So, if nothing has moved of course... <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />

Paragenesis .......formation of minerals as a joined mass.

But, Galadriel, you NEED to know the basics of math! And geography is part of your general knowledge! What else didn't you learn in school?

Qqmber, was it?

Übereil

really ...????



Ah Gal never sell yourself short Hon, you are definitely not stupid, hey you are typing in English 1 of the worlds most difficult languages (due to the large amount of words, that not 1 single soul on this world can remember all of them ) <wow that's really good grammar> you may not have a very well trained mnemonic system, but that is fixable and on
top of that you found this forum ..... so stupid you are not <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />

Swedish is more difficult. Loads and loads of exeptions. It's acually one of the worlds most difficult languages to learn. Don't think it beats French though...

Übereil

Amai!!!! You make me feel like a natural smart-a$$ <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" /> That can do good to a human. But the fact is still that I'm not good in math or geography, and I work as a cleaner in a high-school, where I too often have to hear that we are stupid enough to clean toiolets and do dishes, bring coffee and gossip all day long. But one thing is a fact, all my collegues are kinda big women, and I'm still at my original weight when I started there ('bout 62kg <img src="/ubbthreads/images/graemlins/shhh.gif" alt="" /> <img src="/ubbthreads/images/graemlins/shhh.gif" alt="" /> <img src="/ubbthreads/images/graemlins/shhh.gif" alt="" /> )
And about English, I think French is harder, but what about Russian, Chinese and Arabian?
Anyway thanks for making me feel good about myself, Mea <img src="/ubbthreads/images/graemlins/kissyou.gif" alt="" />!!

S as in Swedish from Ybe


Tomatoe, just to change topic.... <img src="/ubbthreads/images/graemlins/silly.gif" alt="" />


(They say Russian is kinda headache to learn, but I say, hey, the most difficult part in learning one language is to start and to get to know some peeps speaking it to practise it)

Underhand <img src="/ubbthreads/images/graemlins/rolleyes.gif" alt="" /> a vegatable begining with U????

I was on toppic without my notice <img src="/ubbthreads/images/graemlins/eek.gif" alt="" />

Vedgetables, ey?

Übereil

Waffels...
do they count as veggies?

Don't think they do, Seth...

Xuccini. Probably spelled that way. <img src="/ubbthreads/images/graemlins/rolleyes.gif" alt="" />

Übereil

Yams?
Don't know what that is but heard about in "Friends". The part where Brad Pitt was in, they all eat yams for thanksgivingdinner. <img src="/ubbthreads/images/graemlins/stupid.gif" alt="" />

Zwiebeln <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" /> Ok, only in german, in english these are Onions.


Yam

Are you sure???? <img src="/ubbthreads/images/graemlins/confused.gif" alt="" />