Question

atomic number of metal a is 11 why atomic number of metal b is 20 which of them will be more reactive write the chemical reaction of dilute HCL with metal A
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Answer 1

atomic no. 11=Na

atomic no.,=Ca

more reactive=Na

2Na+2HCl--------->2NaCl+H2

hope it helps you

Answer 2

heya ...☺

Metal A=Sodium(Na)

Metal B-Calcium(Ca)

More reactive metal= Na

Reaction with HCL(dil.)=

Na+HCL---->NaCl+H2

hope it works...