Which of the following is the correct order of ionisation energy?

(1) ${\mathrm{Be}}^{+}>\mathrm{Be}$      (2) $\mathrm{Be}>{\mathrm{Be}}^{+}$    (3) $\mathrm{C}>\mathrm{Be}$     (4) $\mathrm{B}>\mathrm{Be}$  

(1) Be possesses a fully filled stable v configuration, or $2{\mathrm{s}}^2$, whereas ${\mathrm{Be}}^{+}$ positive charge makes the removal of an electron far more energy-intensive. Therefore, ${\mathrm{Be}}^{+}$ionisation energy is higher than $\mathrm{Be}$.

(3) As atomic size falls and nuclear size rises during the course of the period, the nucleus tightly holds the electron(s) from the valence shell. Ionisation energy is therefore larger than $\mathrm{Be}$.