Question

Why do the hydrides of O and F in Group 16 and Group 17 respectively show abnormally high melting points and boiling points as compared to other hydrides in
their respective groups? Explain.

Answer 1

because they are highly electronegative

Answer 2

The hydrides of O and F in Group 16 and Group 17 respectively show abnormally high melting points and boiling points as compared to other hydrides in

their respective groups due to presence high electronegativity between them. For example hydrogen fluoride has a melting point of 19.5°C and then there is water(H2O) having the highest specific heat capacity and a boiling point of 100°C. High electronegativity is the reason.