Question

Match list-I with a list -II.
List I List II
(A) Lanthanide contraction (p) s-block
(B) Diagonal relationship (q) Elements of 3rd period
(C) Typical elements (r) f-block
(D) Inner transition elements (s) Be-Al

• A. A - r, B - s, C - q, D - r
• B. A - p, B - r, C - s, D - q
• C. A - s, B - q, C - p, D - r
• D. A - q, B - p, C - r, D - s

Answer 1

The correct option is A A - r, B - s, C - q, D - r

A) Higher z-effective is experienced by f-block elements due to the poor shielding effect of f-electrons. Thus f-block elements experience lanthanide contraction.

B) Be and Al have equal charge densities. The chemical properties of elements depend upon their charge density. Thus they have similar chemical properties. So, Be and Al shows a diagonal relationship.

C) 3rd-period elements are known as typical elements.

D) f-block elements are known as inner-transition elements as f-block elements are placed in between transition elements.

Hence, option A is the correct match.