Class
19
OXYGEN FAMILY 1. Melting and boiling point of hydrides H2O > H2Te > H2Se > H2S 2. Volatility of hydrides H2O > H2Te > H2Se > H2S 3. Thermal stability of hydrides H2O > H2S > H2Se > H2Te 4. Reducing nature of hydrides H2S < H2Se < H2Te 5. Covalent character of hydrides H2O < H2S < H2Se < H2Te
s s la
C
6. Bond angle & dipole moment of hydrides H2O > H2S > H2Se > H2Te (1040) (920) (910) (900)
7. Ease of hydrolysis of hexahalides: SF6 > SeF6 > TeF6 8. The acidic character of oxides (element in the same oxidation state) 9. Acidic character of oxide of a particular element(e.g. S) AO2 > SeO2 > TeO2 > PoO2 So3 > SeO3 > TeO3 10. Stability of dioxides SO2 > TeO2 > SeO2 > PoO2
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