Identify the correct order of electronegativity for $\mathrm{Mg},\mathrm{B},\mathrm{Si}$ and $\mathrm{S}$.

Arrange the following in the correct order of their ionization enthalpies:

$\mathrm{Li}\text{,} \mathrm{Be}\text{,} \mathrm{B}\text{,} \mathrm{N}\text{,} \mathrm{O}$