Question

Atomic number of metal ‚A‛ is 11, while atomic number of metal ‚B‛ is 20.

Which of them will be more reactive? Write the chemical reaction of dilute HCl

with metal A

Answer 1

A = sodium (Na)
B = calcium (Ca)
NaOH + HCl --> NaCl + H2O

Answer 2

The electronic configuration of metal A =2,8,1

Whereas the electronic configuration of metal B is=2,8,2

As metal A has only one electron in the valence shell so it lose it electron quickly as compared to metal B and acquires a stable electronic configuration

So metal A is more reactive than metal B

Reaction of metal A With dilute HCl

A. +. HCl = Acl. +. H2

And here the metal A is Na (sodium)

And metal B is Ca ( calcium)