E-Storep- block elements I
26 Feb 2009 10:57:08 IST
p- block elements I
p - block Elements - I
GROUP 15
- ü N and P non metals, As & Sb metalloids, Bi metal
- ü N<< P < As < Sb < Bi (size )
- ü I.E.↓down the group
- ü electronegativity↓down the group but Sb ≈ Bi
- ü N2 gas, all others solids
- ü M.P. : N< P < Bi < Sb< As
- ü B.P. ↑down the group
- N : -3, +1, +2, +3, +4, +5
- P : -3, +1, +3, +4, +5
- As , Sb : -3, +3, +5
- Bi : +3 , rarely +5
- ü N forms pπ-pπ bonds. All others form dπ-pπ. P & As form dπ-dπ too.
- ü stability and basicity of EH3 compounds↓down the group(E=N,P,As,Sb, Bi)
- ü These form oxides of type E2O3 , E2O5 of which E2O5 is more acidic. acidic character ↓down the group
- ü These form halides of type EX3 , EX5. EX5 are more covalent.
- ü all of these elements form binary compounds with metals showing -3 state. e.g. Ca3P2, Mg3Bi2 etc.
- ü important compounds are dinitrogen, Ammonia, nitric oxide, phosphine etc.
- all members except N show allotropy.
- trick to remember: Nana Patkar Asvarya Sb Bimar
original. not copy-pasted.
Comments (9)
saharsha kumar keshkar
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Joined: 7 Aug 2008 15:43:23 IST
Posts: 1104
26 Feb 2009 10:59:47 IST
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that's quick revision!
26 Feb 2009 11:00:04 IST
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I'll write more articles on other groups of p block soon. comments awaited.
26 Feb 2009 18:29:41 IST
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only 3 comments? hey common guys I know this is helpful
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