Question

Explain the reason for the variation of the first ionization energies of the third period elements

Answer 1

because size of element increases downward

Answer 2

Hey dear,

# Ionisation energy -
- It is the minimum amount of energy required to remove the valence electron of an isolated neutral gaseous atom or molecule.

● For third period element -
- Usually ionization enthalpy increases from left to right in period.
- But for third period elements, increasing order of ionization enthalpy is different -
Na < Al < Mg < SI < S < P < Cl < Ar

This is due to -
- Mg is more stable than Al due to its filled s-orbital (3s2).
- P is more stable than S due to its half-filled p-orbital.

Hope this helps you...