Assertion A: The first ionization enthalpy of 3d series elements is more than that of group 2 metals.

Reason R: In 3d series of elements successive filling of d-orbitals takes place.

Question

Assertion A: The first ionization enthalpy of 3d series elements is more than that of group 2 metals.

Reason R: In 3d series of elements successive filling of d-orbitals takes place.

Canvas Classes · Accepted Answer

Strategy:
 First ionization enthalpy correlates with . In transition series, adding electrons to  orbitals provides less shielding than  or  electrons, causing a significant rise in the attraction for valence  electrons.

Step 1: Evaluate Assertion (A)
- Elements in the  transition series (Sc to Zn) generally have smaller radii and higher  compared to Group 2 metals (like Calcium) because the addition of protons is not fully shielded by the incoming -electrons. (True)

Step 2: Evaluate Reason (R

More questions from Classification of Elements and Periodicity