Question

Compare the ionization enthalpies of the first series of the transition elements.

Answer 1

Ionization enthalpies of first transition series:

1. Ionization energy of the transition element is intermediate between those of s and p block elements.
2. As we move from left to right in a transition metal series, the ionization enthalpy increases as expected. This is due to an increase in nuclear charge corresponding to the filling of d electrons.
3. The increase in first ionisation enthalpy with increase in atomic number along a particular series is not regular. The added electron enters (n-1) d-orbital and the inner electrons act as a shield and decrease the effect of nuclear charge on valence ‘ns’ electrons. Therefore, it leads to variation in the ionization energy values.