$1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^2$ is Si (IV group element).
In this case, first two electrons are to be removed from 3p orbitals and the third electron is removed from fully-filled 3s orbital so third ionization energy will be very high.