Question

If the electronic configuration of metal $A$ is (2, 8, 7) and that of metal $B$ is (2, 8. 2) then :
a. Which metal is less reactive?
b. Write the names of the two metals.
c. Write the balanced chemical equation of reaction of any one metal with hydrochloric acid.

Answer 1

a. Metal ($B$ with electronic configuration (2, 8. 2) is less reactive.
b. $A$ is chlorine. It is non metal. $B$ is magnesium. It is a metal.
c. Write the balanced chemical equation of reaction of any one metal with hydrochloric acid.
$Mg+2HCl\to MgC{l}_2+H_2\uparrow$