Question

Write short notes on the changes in atomic and ionic sizes and ionization enthalpy of transition metals.

Hint:

Transition metals exhibit a gradual change in properties due to d-orbital electron configurations.

Answer 1

Atomic and Ionic Size:  Across a period, atomic size slightly decreases due to poor shielding by d-electrons. Down a group, size increases due to the addition of a new energy level. 

Ionization Enthalpy: Transition metals have higher ionization enthalpy due to their small size and nuclear attraction. \item Ionization energy does not increase significantly across the series because of screening effects.