Question

Two p-block elements x(outer electronic configuration ${ns}^2$, ${np}^3$) and z (outer configuration ${ns}^2$, ${np}^4$) occupy neighbouring positions in a period. Using this information which of the following is correct with respect to their ionisation potential $I_x$ and $I_z$.

• A. I_x > I_z
• B. I_z > I_x
• C. I_z = I_x
• D. Relation between I_x and I_z is uncertain

Answer 1

The correct option is A

I_x > I_z

x has stable electronic configuration due to half filled p-orbital so has more ionization energy than z.