Answer:
(i) Oxygen and sulphur are non -
metals Se and Te are metalloids whereas Po is a metal. Po is radioactive
elements and its half life is 13.8 days. The metallic character increases from
oxygen to polonium.
(ii) Among O, S,
Se, Te. Sulphur has strong tendency to show catenation property it decreases
down the group. All the elements form hydrides of the type [E - O, S, Se, Te, Po]. Since down
the group bond dissociation enthalpy decreases therefore the thermal stability
of hydride also decreases from to .
(iv) Oxygen
shows negative oxidation state - 2 except in its
oxidation state is +2. Polonium hardly shows negative oxidation state. Its
stability decreases down the group. Other elements of the group exhibit + 2, +
4 and + 6 oxidation states Se, Te show + 4 0. S in their compounds with oxygen
and + 6 with fluorine. The stability of + 6 O.S decreases down the group and
stability of + 4 O.S increases due to inert pair effect. Bonding in + 4 and + 6
oxidation state is primarily covalent.
(v) All the
elements show allotropy.
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