Question

Amongst the following elements (whose electronic configuration are given below), the one having the highest ionisation energy is:
(correct answer +1, wrong answer -0.25)

• A. $\left[Ne\right]3s^{2}3p^1$
• B. $\left[Ne\right]3s^{2}3p^3$
• C. $\left[Ne\right]3s^{2}3p^2$
• D. $\left[Ar\right]3d^{10}4s^{2}4p^3$

Answer 1

The correct option is B $\left[Ne\right]3s^{2}3p^3$

Ionization energy of half and completely filled subshell will be high since they are more stable. Also ionization energy decreases with increase in size.
Hence, (b) has the highest ionization energy among the following.