How many of the following atoms have maximum ionisation energy than boron?

(i) $\mathrm{Be}$ (ii) $\mathrm{N}$ (iii) $\mathrm{Al}$ (iv) $\mathrm{Ga}$ (v) $\mathrm{Si}$ (vi) $\mathrm{Mg}$

Where $\mathrm{a}, \mathrm{b}, \mathrm{c}, \mathrm{d}, \mathrm{e}, \mathrm{f}, \mathrm{g}, \mathrm{h}$ are $3^{\mathrm{rd}}$ period elements. If the difference between the atomic numbers of elements $\mathrm{b}$ and $\mathrm{e}$ is $\mathrm{x}$ and the difference between the atomic number of elements $\mathrm{c}$ and $\mathrm{f}$ is $\mathrm{y}.$ What is the value of $\mathrm{x}-\mathrm{y}.$

${\mathrm{A}}^{-}\left(\mathrm{g}\right)\to {\mathrm{A}}^{2+}\left(\mathrm{g}\right) \mathrm{\Delta H}=1100\mathrm{KJ}/\mathrm{mol}$

$\mathrm{A}\left(\mathrm{g}\right)\to {\mathrm{A}}^{2+}\left(\mathrm{g}\right) \mathrm{\Delta H}=1200\mathrm{KJ}/\mathrm{mol}$

Electron gain enthalpy of $\mathrm{A}$ is $\mathrm{P}\times {10}^2\mathrm{KJ}/\mathrm{mol}.$ What is the value of $\mathrm{P}?$

How many of the following elements are more electronegative than Boron.

(i) $\mathrm{H}$ (ii) $\mathrm{Li}$ (iii) $\mathrm{Be}$ (iv) $\mathrm{C}$ (v) $\mathrm{N}$ (vi) $\mathrm{O}$ (vii) $\mathrm{F}$