Question

Atomic number of metal "A" is 11,while atomic number of "B" is 20. Which of them will be more reactive ? Write the chemical reaction of dilute HCL with metal "A".

Answer 1

Metal A will be more reactive since it has only one valence electron whereas Metal B has two, which makes it easier to lose the electron and form bonds.

Metal A is Sodium.

2HCl + 2Na -------> 2NaCl + H_{2}

Answer 2

A will be more reactive

2Na+2HClgives 2NaCl+H2(one mole of hydrogen)