The p-Block Elements

The p-Block Elements

Question

Give reasons:
Thermal stability decreases from H2O to H2Te.

Answer

The thermal stability of the hydrides of group 16 elements decreases down the group, i.e., H2O > H2S > H2Se > H­2Te > H2Po. This is because M-H bond dissociation energy decreases down the group with the increase in the size of a central atom. 

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