Inert pair effect | The p-block elements | Inorganic Chemistry | Khan Academy

In certain groups of the p-block, the heavier members are generally observed to be stable in a lower oxidation state (that is lower than the group oxidation state by two units). Inert pair effect explains why this happens so!
Timestamps
00:05: Where do we see the effect of inert pair effect?
01:35: What is shielding?
02:50: Do all inner electrons have same shielding capacity?
03:35: What does shielding depend on?
04:25: Which of them has better shielding power: s or p orbital and why?
05:55: Order of shielding power
06:40: What is the consequence of poor shielding?
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Created by
Revathi Ramachandran

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[@olivermuhe8122]

Isn‘t that Video more about the d-Block-Contraction, rather then the Inertert-Pair-Effect?
I thought the Inert-Pair-Effect is caused by the increased speed of the s-electrons which ends in a relavistic effect that increases their mass. Therefor the orbitals contract and the ionisationenergy increases, which makes it harder to form bonds with the s-orbital valenzelectrons.