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The EAN rule...plzz seee , it will help

Himanshu

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27 Jul 2007 15:39:20 IST

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27 Jul 2007 15:39:20 IST

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The EAN rule...plzz seee , it will help

Chemistry , Inorganic Chemistry

This is an imp. rule...it explains the stability of complexes on the basis on effective atomic number -:

EAN of a metal in a complex is the no. of electrons present in the metal ion plus the no. of electrons donated to it by the ligands.

this may be calculated as

EAN of metal in a complex = At. No - Oxdn state + 2 x co-ordination no.

A stable complex is formed , if the EAN is = to the atomic ni. of next noble gas

for example....

[Co(NH3)6]³⁺.....oxdn state = + 3 .....at no. = 27....co-ord. no = 6......

so its EAN = 27 - 3 + (2x6) = 36 i.e at no. of Kr

This rule can also be used to calculate the no. of ligands attatched to a meta ion/atom.....

eg..

a) To calculate the no. of CO that can b attatched to Ni

at no. of Ni = 28

At no. of next noble gas = 36

no. of electrons to b provided by the ligands = 36-28 = 8

as each CO provides 2 electrons , no. of CO grps to be attatched to Ni = 8/2 = 4

so it is [Ni(co) ₄ ]

or take eg of Fe

at. no. of Fe = 26

next noble gas config. = 36

so no. of electrons = 10

so 5 CO molecules

i.e [Fe(CO)₅)

HOPE THAT IT HELPS U ALLL

ALL THE BEST...

CHEERS! ! ! !! !

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Comments (9)

Himanshu

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27 Jul 2007 15:39:59 IST

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PLZZ POST UR COMMENTS WHETHER U LYK IY OR NT
ITS SELF WRITTEN.....

Nivedh Iyer

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27 Jul 2007 15:46:33 IST

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who will not like such an article maan......splendid...........

Akansha

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27 Jul 2007 15:49:31 IST

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gud work !!!!!!!!!!!!!!!!!!

Gurbrinder Singh

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27 Jul 2007 16:19:31 IST

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gudddddddddddddddddd

Apoorva .

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27 Jul 2007 18:14:04 IST

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really gud n helpful

sudarsan srikanth

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27 Jul 2007 18:59:38 IST

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nice

kasirajan

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27 Jul 2007 20:15:25 IST

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it has helped me a lott........thanxx keep posting more articles......

Himanshu

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30 Jul 2007 01:14:03 IST

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my plesure :) :)

twinkle dream

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2 Aug 2007 18:40:43 IST

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cool job
well done

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