Which of the most convalent ?

The halogen having the smallest convalent radius is

The halogen having the smallest convalent radius is

Answer the following : (a) Name of element of group 13 which forms the most stable compound in +1 oxidation state. (b) Name the element of group 13 which has the highest first ionisation enthalpy. ( c) Name the element of group 13 which is used as a reducing agent in metallurgical processes. (d) Name of element of group 13 which can show convalency maximum of four only. Name the compound of aluminium which is used as a germicide and coagulant of the purification of water. (f) Name the first two elements of group 13 .

Identify the correct order in which the convalent radius of the following elements increases ? (i) Ti (ii) Ca (iii) Sc

IIIA group element which forms only convalent compounds either in anhydrous state or in aqueous state is