Amongst the following elements (whose electronic configuration an given below) the one having highest ionization energy is

Options

A. `[Ne]3s^(2)3p^(1)`
B. `[Ne]3s^(2)3p^(3)`
C. `[Ne]3s^(-2)3p^(2)`
D. `[Ar]3d^(10)4s^(2)4p^(3)`

Answer

B

Explanation

b) The electronic configured of options b) and d) have exactly half-filled 3p orbitals b), represents phosphorus and c) represents arsenic but b) is smaller in size than d). Hence, b) has highest ionisation enthalpy. Ionisation enthalpy increases left to right in the periodic table as the size decreases.