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What is Inert pair effect ? Explain in detail with examples... :]
Asked by Shreyansh Jain(student) , on 3/2/13


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EXPERT ANSWER

Group 13 elements have ns2np1 electronic configuration. Hence they would be expected to be trivalent. In most of their compounds this is the case, however for the heavy elements lower oxidation states are more stable. This is explained by the s electrons remaining paired and not participating in bond formation. This inertness of s-subshell electrons towards the bond formation is called inert pair effect. This happens because the s orbitals are held closer to the nucleus, therefore the electrons present in s orbitals are held strongly by nucleus because of large electrostatic forces. Hence the energy required to unpair the s-electrons is high because of which they remain paired. 

for example:

1) In 13th group, thallium can exhibit +1 and+3 oxidation states but it is stable in +1 oxidation state only due to inert pair effect

2) In 14th group , lead shows both +2 and +4 oxidation states but it is stable in +2 oxidation state due to inert pair effect.

Posted by Kirti Gogia(MeritNation Expert)on 4/2/13

This conversation is already closed by Expert

More Answers

helloo!!!

 it is the tendency of the outermost electrons to remain unionised and unshared of post  transitions metals.The term  is often used in relation to the increasing stability of oxidation state  that are 2 less than the group valency for the heavier elements of groups  13,14,15 nd 16

for example:
1) In 3rd A group, thallium can exhibit +1 and+3 oxidation states but it is stable in +1 oxidation state only due to inert pair effect
2) In 4th A group , lead shows both +2 and +4 oxidation states but it is stable in +2 oxidation state due to inert pair effect

hope this answer will help u

 

 

effect.

Posted by Snehal Pillai(student)on 1/2/13

 sorry by my mistake i put one extra effect in last sentence....plz don 't mind that....

Posted by Snehal Pillai(student)on 1/2/13

it is the reluctance of s orbital to take part in bonding

Posted by Sangeetha Cv(student)on 1/2/13

the inertness of inner ns electrons to chemical bonding is called inert pair effect which happens due to - 

on moving down a group electrons are added to the d and f orbital.....these orbitals due to their shape have a poor shielding effect and hence nuclear charge increses....so the inner  electrons show inertity and do not take part in bonding.....

eg.

1. in group 13 where group oxidation state is +3(sum of outer s and p electrons)..on moving down the group due to inert pair effect elements like thalium and indium have +1 as more stable oxidation state....

2.similarly in group 14 where group oxidation state is 4, element Pb has +2 as stable oxidation state again due to inert pair effect .

hope u got it.....

Posted by The Rocky Stud...(student)on 1/2/13

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