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(D) The ionisation energy is the energy required to remove an electron from a gaseous atom or ion. $A$ large jump in successive ionisation energies oc

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$1s^2, 2s^2p^6, 3s^2$

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(D) The ionisation energy is the energy required to remove an electron from a gaseous atom or ion. $A$ large jump in successive ionisation energies occurs when an electron is removed from a stable,noble gas-like configuration. If the jump occurs between the second and third ionisation energies,it means the first two electrons are removed easily,but the third electron is removed from a stable,fully filled shell. This implies the element has $2$ valence electrons. The configuration $1s^2, 2s^2p^6, 3s^2$ corresponds to Magnesium $(Mg)$,which has $2$ valence electrons in the $3s$ orbital. Removing the first two electrons leaves a stable $2s^2p^6$ configuration; removing the third electron requires significantly more energy.

$A$ sudden large jump between the values of second and third ionisation energies of an element would be associated with the electronic configuration:

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