Re: Anomalous Pattern in Stability of the 4th Period 'p-block' Elements:
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Posted by DR. KAUSIKISANKAR PRAMANIK on April 18, 19102 at 10:07:58:
In Reply to: Anomalous pattern in CCl4 and SiCl4 m.p's posted by QuasiQuasar on June 29, 19101 at 08:21:15:
: How can we explain why the higher oxidation state of the 4th period 'p-block' elements is relatively unstable compared to ogous compounds of lighter(3rd period) & heavier (5th period) congeners respectively: such as (i) AsCl5 is unstable compared to both PCl5 and SbCl5, (ii) H2SeO4 is unstable compared to both H2SO4 and H6TeO6, which is reflected from the superior oxidizing power of H2SeO4, and (iii) BrO4- is unstable compared to both ClO4- and IO4-, which is reflected from the higher reduction potential of BrO4- (perbromate ion)?
: Is there any relation of energy gap between 4s-4p-4d AOs (or in other words, promotion energy/hybridization energy become a factor!)with the above trends?
:Have 'Relativistic Effects' any Correlation with the above trends?
: Queer isn’t it??
: Till now I’ve found no explanation to this. Some help needed please…
DR. KAUSIKISANKAR PRAMANIK
Dept. of Chemistry
J D College
Kolkata (Formarly Calcutta)
INDIA
Email: kpramanik@hotmail.com
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