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Topic: Electronic Structure and the Periodic Table  (Read 20972 times)

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Offline Stephen

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Re: Electronic Structure and the Periodic Table
« Reply #15 on: July 04, 2009, 07:22:11 PM »
Quote from: Astrokel on July 04, 2009, 01:12:22 PM
Usually data will be provided and you will have to explain based on your knowledge on their electronic configuration and orbitals structure. There are many exceptions to the general trends but if you were to notice it, they are more or less the same, not exactly the same but i think you get what i meant. Just remember the basic rules and the links i have posted. Try to figure out the reasons behind those doubts you have posted and it will come it easy as you go along.

Let's start with Ga>Al

Why is it an exception? How do you explain this exception?
just one suggestion Al>Ga not opposite!
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Offline UG

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Re: Electronic Structure and the Periodic Table
« Reply #16 on: July 04, 2009, 11:38:17 PM »
Huh?  ???
An aluminium atom is larger than gallium?  :o
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Offline UG

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Re: Electronic Structure and the Periodic Table
« Reply #17 on: July 04, 2009, 11:42:04 PM »
Now that is weird, I had not realised that.
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Offline Astrokel

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Re: Electronic Structure and the Periodic Table
« Reply #18 on: July 05, 2009, 12:05:59 AM »
Quote
Just one suggestion Al>Ga not opposite!
Yes this is correct.
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Offline Stephen

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Re: Electronic Structure and the Periodic Table
« Reply #19 on: July 05, 2009, 07:09:02 AM »
Is this correct?!You didn't see I answered....:D

I found out answer for this...because there is whole row of d-elements behind Ga and he has much more + charge so attractive forces are bigger then the ones in Al so he is smaller than Al!

I let you explain to me other irregulars because I couldn't find out answer for rest of the questions..
I'm listening.... ;D
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Offline Astrokel

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Re: Electronic Structure and the Periodic Table
« Reply #20 on: July 05, 2009, 11:37:27 AM »
Hmm..well not quite right but i can tell you got the idea. It is because of the poor shielding effect of 3d electrons in the first row of transition elements that affects gallium atomic radius.
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Offline Stephen

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Re: Electronic Structure and the Periodic Table
« Reply #21 on: July 06, 2009, 09:34:25 AM »
Oooh I get it....
So, what are explanations for other questions I've asked!?
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Offline Astrokel

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Re: Electronic Structure and the Periodic Table
« Reply #22 on: July 06, 2009, 10:11:25 AM »
Quote
Li>Be, Si>P but, He>H, Ne>F How to know that He is bigger then H or Ne is bigger then F?!
Read on Van der waals radius

Quote
Ga=Ge, Sb>Sn, Pb>Tl Po>Bi

I believe it is due to inert pair effect and relativistics contraction as they are prominent as you move to heavier atoms. As for Ga=Ge, i have no idea. Where do you get this information from?
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Offline ugbede

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Re: Electronic Structure and the Periodic Table
« Reply #23 on: July 06, 2009, 05:16:22 PM »
Read Chemistry by raymond chang. It all piece of cake
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Offline Stephen

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Re: Electronic Structure and the Periodic Table
« Reply #24 on: July 06, 2009, 07:00:54 PM »
Quote from: Astrokel on July 06, 2009, 10:11:25 AM
Quote
Li>Be, Si>P but, He>H, Ne>F How to know that He is bigger then H or Ne is bigger then F?!
Read on Van der waals radius

Quote
Ga=Ge, Sb>Sn, Pb>Tl Po>Bi

I believe it is due to inert pair effect and relativistics contraction as they are prominent as you move to heavier atoms. As for Ga=Ge, i have no idea. Where do you get this information from?
From one book....Says, well there is table with atomic radius of all elements except transition metals and there are values of those elements and there is same number for Ge and Ga!
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Offline UG

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Re: Electronic Structure and the Periodic Table
« Reply #25 on: July 06, 2009, 08:17:44 PM »
On wikipedia is says the atomic radius for germanium is 122 pm and 135 pm for gallium.
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Offline Stephen

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Re: Electronic Structure and the Periodic Table
« Reply #26 on: July 06, 2009, 08:36:04 PM »
Quote from: UG on July 06, 2009, 08:17:44 PM
On wikipedia is says the atomic radius for germanium is 122 pm and 135 pm for gallium.
Well I have information that
Ge-0.122
Ga-0.122

@Someone don't know who told for book of Raymond, well I looked up the internet and there's only on Spanish!Am i wrong!?
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Offline Astrokel

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Re: Electronic Structure and the Periodic Table
« Reply #27 on: July 07, 2009, 04:30:05 AM »
Quote
From one book....Says, well there is table with atomic radius of all elements except transition metals and there are values of those elements and there is same number for Ge and Ga!
I wouldn't take the value too seriously because it really depends on what is the measuing techniques used. I will look up informations and think about it when i have the time.
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Offline Stephen

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Re: Electronic Structure and the Periodic Table
« Reply #28 on: July 07, 2009, 08:56:21 AM »
oK....
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Offline Stephen

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Re: Electronic Structure and the Periodic Table
« Reply #29 on: July 07, 2009, 04:52:13 PM »
Just one more thing ::)
I don't know how do you call it, you know not book but a book ;D in which there are a lot of exercises not theory just exercises!?How do you call it!? :DWell I want to know the name of the best ,,that kind of book,, of nonorganic chemistry to practise a little bit!?Do you know some good book!?It can be a little bit harder not a problem but to have and easier exercises too.
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