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An element A occupies group number 17 an...

An element A occupies group number 17 and period number 2, is the most electronegative element. Element A reacts with another element B, Which occupies group number 17 and period number 4, to give a compound C. CompoundC undergoes `sp^3 d^2` hybridisation and has octahedral structure. Identify the elements A and B and the compound C. Write the reactions.

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