Question

Short note on ionization enthalpy of d block elements

Answer 1

The first Ionisation enthalpy lies in between S- block and P-block elements.

In a series from left to right, ionisation enthalpy increases due to increases in nuclear charge.

The irregular trend of first Ionisation enthalpy of 3d metals, can be accountable by considering that the removal of one electron alters the relative energies of 4s and 3 d orbitals.

ionisation enthalpy value for 5d series are higher than that of 3d and 4d series due to weak sheilding of 4f electrons present in 5 d sereis transition metals. Ionisation enthalpy values of Zn, Cd., and Hg are abnormally higher on account of greater stability of s- sub shell.

Answer 2

Explanation:

Transition metalshave smaller atomic radii and higher nuclear charge as compared to the alkali metals. ... The ionisation energyincreases due to the increase in the nuclear charge with atomic number at the beginning of the series. Gradually, the shielding effect of the added electrons also increases.