Which of the following transformation least energy is required?

Options

A. `F_((g))^(-)rarrF_((g))+e^(-)`
B. `P_((g))^(-)rarrP_((g))+e^(-)`
C. `S_((g))^(-)rarrS_((g))+e^(-)`
D. `Cl_((g))^(-)rarrCl_((g))+e^(-)`

Answer

B