Question

Which of the following elements will have highest second ionization enthalpy?

• A. $1s^{2}2s^{2}2P^{6}3s^{2}$
• B. $1s^{2}2s^{2}2P^{6}3s^{1}$
• C. $1s^{2}2s^{2}2P^{6}3s^{2}3P^{2}$
• D. $1s^{2}2s^{2}2P^{6}3s^{2}3P^{3}$

Answer 1

Answer: (B)

$1s^{2}2s^{2}2P^{6}3s^{1}$

Answer 2

: After losing one electron, the atom will get a stable configuration and its second ionisation energy will be very high.