Why 5d transition series elements have higher ionization enthalpy than 4d transition series elements?
Answers
Answered by
6
Even poorer shielding of f-orbital, causing Lanthanide contraction in 5d transition elements (which do have filled 4f orbitals), as compared to no 4f orbitals in 4d transition elements.
The contraction results in stronger pull of the outer electrons by the nucleus, that is, increased Zeffective, hence the increased ionization enthalpy.
Similar questions