Question

The first element of a group in many ways differs from the other heavier members of the group. This is due to :

• A. the smaller size
• B. the high electronegativity and high ionisation potential
• C. the unavailability of d-orbitals
• D. the higher shielding effect

Answer 1

Answer: (A), (B), (C)

The correct options are
A the smaller size
B the high electronegativity and high ionisation potential
C the unavailability of d-orbitals

The first element of each of group in s and p-block except noble gases differ in many aspects from the other members of their respective group.This propert is called as ANOMALOUS Property , because of the following reasons.
A) The smaller size of the first element .
B) The higher electronegativity and higher ionization potential of the first element.
C) The unavailability of d-orbitals in the first element.
D) But not because of the higher shielding effect.
Hence option A,B & C are correct.