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

1.	Four elements A, B, C and D along with their electronic configuration are given below :ElementsABCDElectronic configuration2,12,82,8,12,8,8Now 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» (i) A and B, C and D have the same period. (ii) A and C have one valence electron, so the same group. (iii) C is more reactive because C is placed below A in the periodic table and reactivity increases down the group.

Four elements A, B, C and D along with their electronic configuration are given below :ElementsABCDElectronic configuration2,12,82,8,12,8,8Now 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»

(i) A and B, C and D have the same period.

(ii) A and C have one valence electron, so the same group.

(iii) C is more reactive because C is placed below A in the periodic table and reactivity increases down the group.