Four elements A, B, C and D along with their electronic configuration are given below: Now answer the following questions: (i) Which two elements belong to the same period ? (ii) Which two elements belong to the same group ? (iii) Which element out of A and C is more reactive and why?

Four elements A, B, C and D along with their electronic configuration

1.	Four elements A, B, C and D along with their electronic configuration are given below: Now answer the following questions: (i) Which two elements belong to the same period ? (ii) Which two elements belong to the same group ? (iii) Which element out of A and C is more reactive and why?
Answer» Solution :(i) A and B, C and D belong to the same period. (ii) A and C have one valence ELECTRON, so they belong to same GROUP. (III) C is more REACTIVE because C is placed below A in the PERIODIC table and reactivity increases down the group.