Question

Why sodium ion has higher ionization enthalpy than neon?

Answer 1

Answer:

The ionization enthalpy of Na+ ion (second ionization enthalpy of sodium ) is more than twice that of Ne. ... So, the electrons in the outer shell (2s2 2p6) are more tightly bound to the nucleus in Na+ ion than in the neutral Ne atom. Higher the effective nuclear charge, higher will be the ionization energy.