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Sir Goulum 10-06-2002 02:58 PM

I need some help with some homework. Where can I find a periodic table that, somewhere, shows the atomic structure of the Elements? Thanks!

Bardan the Slayer 10-06-2002 03:13 PM

Does this site help? It needs flash, though.

http://www.chemsoc.org/viselements/p...rtable_fla.htm

Sir Goulum 10-06-2002 03:19 PM

No...it needs to have a picture of the atomic structure for the elements that I can draw. Much like this, but this is completely wrong. (My teacher said so) http://chemicalelements.com/bohr/b0036.gif

WillowIX 10-06-2002 05:32 PM

Yes that is wrong. Let´s see if I can help you out some. You know the different designations of the electron configuration right? (K, L, M, N). K can only contain two atoms and fill up first. L can contain 8 electrons. After that the difficulty starts. You´re not studying quantum mechanics are you? I´ll just skip the theory for that lol [img]smile.gif[/img] . M can actually contain 18 electrons. BUT first it contains 8, then N gets 2 electrons. After that you can start to fill M again up to 18 BEFORE you add to N (this is called the aufbau model. So your example would be

<ul>[*]K-->2e<sup>-</sup>[*]L-->8e<sup>-</sup>[*]M-->18e<sup>-</sup>[*]N-->8e<sup>-</sup>[/list]Did that clear things up?

[ 10-06-2002, 05:35 PM: Message edited by: WillowIX ]

Sir Goulum 10-06-2002 05:36 PM

We just call the diff things levels, but ok...So it goes 2, 8, 18, 8?

EDIT- I'm only in Grade 9! [img]tongue.gif[/img]

[ 10-06-2002, 05:37 PM: Message edited by: Sir Goulum ]

LennonCook 10-06-2002 05:42 PM

<font color="lightblue">It does have Chemical Information ;)
Click the element you want, and scroll down to "Chemical Data", click HTML.
Under Physical Information, it gives you what you need to know:
Atomic Number 6
Relative Atomic Mass (12C=12.000) 12.011

That is from Carbon.

The atomic number relates to the number of electrons and protons both, the Relative Atomic Mass is the Number of Protons plus the number of Neutrons.

That gives you enough information to draw the nucleus, in this case there are 6 protons and 6.011 Neutrons, although 6 Neutrons would generally be accepted at the level you`re doing. [img]smile.gif[/img]

The only complication is the electron shells: just remember the pattern 2,8,8,16 ; that should be as far as you need go [img]smile.gif[/img] </font>

<font color="gold">EDIT: Ok, to quote from my science text book:
The total number of electrons allowed in a shell n and all those before it, is 2n<sup>2</sup>.

Thus,

Shell Number (n) ..... Maximum Number of Electrons (2n<sup>2</sup>).
1 ..... 2
2 ..... 8
3 ..... 18
4 ..... 32
etc etc

Here the book starts getting very... wierd.
It gives a diagram of a Chlorine atom, with 2,8,7.

But from the table it gives, it should be 2,6,8 ... I have always learned 2,8,8,16; so er... ignore 2n<sup>2</sup> :D </font>

[ 10-06-2002, 05:54 PM: Message edited by: LennonCook ]

andrewas 10-06-2002 05:48 PM

Willow has it right. It does get even more complex in a couple years though.

Each electron shell consists of electron orbitals, each electron orbital contains up to two electrons. 1 "p" type, 3 "d" types and 5 "f" types if memory serves. Which is probably dosent, and theres one after "f" which totaly escapes me. The designation isnt important anyway, the principle is.

Now, you know that shells have different energy levels, right?

Well, the orbitals within those shells also have slightly varying energy levels, and in the higher shells p type orbitals have less energy than the f types from the previous level. Since its, strictly speaking, orbitals and not shells that fill up in order of energy level, the "p" type in shell "M" fills up before the "f" types in shell "N"

Now are you glad that you dont have to study the theory behind all this for another couple years? Anyway, I usualy find it easier to remember stuff like this by learning the reason why, so maybe some of this will be useful.

Sir Goulum 10-06-2002 05:49 PM

Quote:

Originally posted by LennonCook:
<font color="lightblue">The only complication is the electron shells: just remember the pattern 2,8,8,16 ; that should be as far as you need go [img]smile.gif[/img] </font>
16?! But Willow said it was 18!!! Oh I'm all confused! [img]tongue.gif[/img]

WillowIX 10-06-2002 05:50 PM

Yes Sir G that would be correct (not your post right above this one, but further up [img]smile.gif[/img] ). I found this for you, it has the number of electrons in ech "level" listed [img]smile.gif[/img] http://www.chemicalelements.com/show...onconfig.html.
Quote:

Originally posted by LennonCook:
The only complication is the electron shells: just remember the pattern 2,8,8,16 ; that should be as far as you need go
You can´t think that way. The number of electrons in each level would be 2,8,18,32,32 etc. How they fill up is completly different... It´d be like this: 2,8,8,2-->2,8,9,2-->2,8,10,2.....-->2,8,18,3...-->2,8,18,8-->2,8,18,8,1. It´s all a matter of energy [img]smile.gif[/img]

[ 10-06-2002, 05:51 PM: Message edited by: WillowIX ]

andrewas 10-06-2002 05:51 PM

Quote:

Originally posted by LennonCook:

The only complication is the electron shells: just remember the pattern 2,8,8,16 ; that should be as far as you need go [img]smile.gif[/img] </font>

And just what element fills N to 16 before filling M to 18?

Actualy, IIRC, N can hold up to 32, but thats getting may beyond anything I officialy studied.


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