Question

The first ionization energy of the $\mathrm{d}$-block elements lie between ________ .

Answer 1

Trends in Ionization energy:

• The ionization energy gradually increases with an increase in atomic number across a series.
• The increase in ionization energy is due to the increase in nuclear charge with increasing atomic number.
• As the nuclear charge progressively increases, it becomes more difficult to remove the outermost electron from the element, and hence ionization energy increases.
• The first ionization energies of $5\mathrm{d}$elements are higher as compared to those of $3\mathrm{d}$ and $4\mathrm{d}$ elements.

Therefore, the first ionization energy of the $\mathrm{d}$-block elements lie between $\mathrm{s}\mathrm{and}\mathrm{p}\mathrm{block}\mathrm{elements}$.