Answer :

From the configuration,


Metal A is Sodium or Na-2,8,1


Metal B is Calcium or Ca-2,8,8,1


Metal A i.e Sodium is more reactive than Calcium. Sodium metal reactive than calcium and it even reacts when kept open in the air.


Reaction With dil.HCl:


Sodium reacts vigorously with dilute hydrochloric acid to form sodium chlorides and hydrogen.



Calcium reacts less vigorously to form calcium chloride and hydrogen gas.



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