Explain the nature of oxides of group-$16$ elements. Write a note on halide compounds of group-$16$ elements. Write a note on hydride compounds of group-$16$ elements.

(N/A) Group-$16$ elements form hydrides of type $H_{2}E$ $(E=O, S, Se, Te, Po)$. Acidic strength increases down the group $(H_{2}Te > H_{2}Se > H_{2}S > H_{2}O)$ due to decreasing $H-E$ bond dissociation enthalpy. Thermal stability decreases down the group $(H_{2}O > H_{2}S > H_{2}Se > H_{2}Te)$. Reducing property increases down the group $(H_{2}Te > H_{2}Se > H_{2}S > H_{2}O)$.
Oxides are of type $EO_{2}$ and $EO_{3}$. $SO_{2}$ is a gas,$SeO_{2}$ is solid. Stability and acidic strength of $EO_{2}$ and $EO_{3}$ decrease down the group ($SO_{2} > SeO_{2} > TeO_{2}$ and $SO_{3} > SeO_{3} > TeO_{3}$).
Halides are of type $EX_{6}, EX_{4}, EX_{2}$. Hexafluorides are stable and octahedral. Tetrafluorides $(EX_{4})$ have $sp^{3}d$ hybridization (see-saw geometry). Dihalides $(EX_{2})$ have $sp^{3}$ hybridization (tetrahedral). Monohalides are dimeric and undergo disproportionation.