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BlackPenguin
Junior Member
Joined: 31 Dec 2005
Posts: 4
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 Posted: Sat Dec 31, 2005 5:14 pm Post subject: Grp II - melting points |
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hi
Do any of you know why the the first four elements melting points in this grp. seem to not follow any pattern. You would expect them to increase going down the group like they do in all other grps.
The melting points are:-
*Mg: 922K
*Ca: 1112K
*Sr: 1042K
*Ba: 998K
Thanks
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opuntia
Regular
Joined: 15 Jun 2005
Posts: 82
Location: Maldives(the chain of islands)
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| Posted: Mon Jan 02, 2006 3:08 am Post subject: |
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| Actually in Group two, the melting temperature falls down the group because as the group descends, the atoms get larger and the bondings become weaker, but Mg does not follow the trend.
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BlackPenguin
Junior Member
Joined: 31 Dec 2005
Posts: 4
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| Posted: Mon Jan 02, 2006 3:48 pm Post subject: |
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thanks, for clearing that up.
anyone no why Mg doesn't follow the trend
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opuntia
Regular
Joined: 15 Jun 2005
Posts: 82
Location: Maldives(the chain of islands)
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| Posted: Tue Jan 03, 2006 11:56 am Post subject: |
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I enjoyed doing it! 
I don't know the reason, but if you like i can ask my teacher that question when the semester begins, that's on 15th of this month. 
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BlackPenguin
Junior Member
Joined: 31 Dec 2005
Posts: 4
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| Posted: Tue Jan 03, 2006 2:23 pm Post subject: |
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| if you can do that it would be great. my teacher wasn't sure of the reason. thanks again
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opuntia
Regular
Joined: 15 Jun 2005
Posts: 82
Location: Maldives(the chain of islands)
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| Posted: Tue Jan 03, 2006 3:26 pm Post subject: |
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| No problem, i'll ask and tell you what my teacher says
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Megadbol
A really tough bot, or a member.
Joined: 08 Mar 2006
Posts: 2
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| Posted: Wed Mar 08, 2006 12:39 pm Post subject: |
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oh really? 
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opuntia
Regular
Joined: 15 Jun 2005
Posts: 82
Location: Maldives(the chain of islands)
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| Posted: Sat Apr 01, 2006 11:34 am Post subject: |
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| BlackPenguin wrote: |
thanks, for clearing that up.
anyone no why Mg doesn't follow the trend |
After a long time i got the answer, or so i guess, it has got something to with the Mg's net nuclear charge...well that's what my teacher told me 
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charco
Regular
Joined: 07 Mar 2005
Posts: 96
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| Posted: Tue Apr 11, 2006 11:28 pm Post subject: |
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| your teacher is bluffing
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