How would you explain the fact that first ionisation enthalpy of sodium is lower than that of magnesium but its second ionisation enthalpy is higher than that of magnesium ?

How would you explain the fact that first ionisation enthalpy of sodiu

1.	How would you explain the fact that first ionisation enthalpy of sodium is lower than that of magnesium but its second ionisation enthalpy is higher than that of magnesium ?
Answer» Solution :emoving 1 electron from the outer orbital of sodium atom, the ion formes the most stable configuration of inert atom gas neon. The SECOND electron is REMOVED from ONE of the 2p-orbitals which are completely filled i.e., have a total of 6 electron and are closer to the nucleus.