Question
Which of the following elements will have highest second ionisation enthalpy?
A.
$$1{s^2}2{s^2}2{p^6}3{s^2}$$
B.
$$1{s^2}2{s^2}2{p^6}3{s^1}$$
C.
$$1{s^2}2{s^2}2{p^6}3{s^2}3{p^2}$$
D.
$$1{s^2}2{s^2}2{p^6}3{s^2}3{p^3}$$
Answer :
$$1{s^2}2{s^2}2{p^6}3{s^1}$$
Solution :
After losing one electron, the atom will get a stable configuration and its second ionisation energy will be very high. Hence, option (B) is correct.