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Chemistry Help

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wnab21
Posts: 1313 - Karma: 18
Quick homework help. I will give anyone karma who helps.


For main group elements , how does the number of core electrons vary across a period.

Any help is appreciated, thanks.
Oct 26 2009 8:39PM
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BootySpunk.
Posts: 8148 - Karma: 84
http://www.chemistry.montana.edu/chem131/notes/Lec21notes.pdf

Read those slides...the first and last page is what I think you are looking for.
Oct 26 2009 8:40PM
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wnab21
Posts: 1313 - Karma: 18
thanks man, so basically it increases by one?
Oct 26 2009 8:44PM
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TimmyK
Posts: 779 - Karma: 15
The atomic number increases as you go left to right on the periodic table, the atomic number represents the number of protons in the nucleus, and an element has a neutral charge, so it will have to possess an equal number of electrons.  So yes, as you move across a period left to right the number of electrons increase.
Oct 26 2009 9:44PM
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Slinger1x1
Posts: 8853 - Karma: 66
across a period? electrons increase by 1... have you looked at a periodic table?
Oct 26 2009 10:23PM
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Slinger1x1
Posts: 8853 - Karma: 66
just kidding, valance electrons increase by 1
core electrons stay the same...
Oct 26 2009 10:24PM
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1337
Posts: 31054 - Karma: 29,240
unless we are talking about the first period, in which it does increase as you go across. also i believe that they either grow closer to the nucleus as they go across. dont quote me but im pretty sure thats what happens
Oct 26 2009 10:38PM
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Uncle.Badness
Posts: 2545 - Karma: 55
1
Oct 26 2009 10:47PM
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chapz
Posts: 10182 - Karma: 66
accross a period, core electrons remain the same, valence electrons increase. down a group, shielding is increased because there are more core electrons, and the elements dont get all the love they want from the nucleas, so it's easier to remove electrons.

ahaha wow i hate chemistry. i took that chem last semester, and already forget soooooooo much of it!
Oct 26 2009 10:49PM
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jayo.
Posts: 5015 - Karma: 34
you are correct.

and yeah, the atomic number increases by one as you go across each period
Oct 26 2009 10:51PM
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Slinger1x1
Posts: 8853 - Karma: 66
"For main group elements , how does the number of core electrons vary across a period."

the number of core electrons does not vary

i dont know if you guys learned the SPDF shells yet, but you will see.
Oct 26 2009 10:51PM
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chapz
Posts: 10182 - Karma: 66
ewwwwwwwwwww. i hated that shit! S1S2P2S3P3S4D10 i think? ahah
Oct 26 2009 10:53PM
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Slinger1x1
Posts: 8853 - Karma: 66
well i mean thats a possibility? but thats not really written correctly

I LOVE AP CHEM!!!! i got a 79 on my last test

funny enough, thats a 4.0
Oct 26 2009 11:00PM
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1337
Posts: 31054 - Karma: 29,240
are you kidding me? of course i know my shells
do you know your quantum numbers? THOSE blow ass

n:1 m: 0 l:0 spin: 1/2
Oct 26 2009 11:03PM
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wnab21
Posts: 1313 - Karma: 18
i better just not read anymore of this thread all of this other stuff is just confusing me now
Oct 26 2009 11:07PM
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