Write the order of thermal stability of the hydrides of Group 16 elements.

The enthalpy of dissociation of H-E bond (E= O, S, Se, Te, Po) in the hydrides decreases down the group. Hence, the thermal stability of the hydrides decreases down the group. The thermal stability is in the order H₂O > H₂S> H₂Se> H₂Te >H₂Po.