Question

Write the order of thermal stability of the hydrides of group 16 elements

Answer 1

On moving down the group the thermal stability of the elements decreases because -

-There is an increase in the size of the atoms as the atomic the number of shells increases when we move down the group.

-So, the bond dissociation enthalpy of hydrides H-E (the energy required to break the bond of one mole of elements) decreases.

Thus the order of thermal stability will be; H2O > H2S > H2Se>H2Te> H2Po.