Given below are two statement: one is labelled as
Assertion A and the other is labelled as Reason R
Assertion A: 5f electrons can participate in bonding to a far greater extent than 4f electrons
Reason R: 5f orbitals are not as buried as 4f orbitals
In the light of the above statements, choose the correct answer from the options given below
Assertion A and the other is labelled as Reason R
Assertion A: 5f electrons can participate in bonding to a far greater extent than 4f electrons
Reason R: 5f orbitals are not as buried as 4f orbitals
In the light of the above statements, choose the correct answer from the options given below
- (A)Both A and R are true but R is NOT the correct explanation of A
- (B)Both A and R are true and R is the correct explanation of A✓ Correct
- (C)A is false but R is true
- (D)A is true but R is false
Answer: (B)
Solution
Both statements are true. The 5f orbitals in actinides are less shielded (not as buried) compared to the 4f orbitals in lanthanides. This means electrons in 5f orbitals experience less effective nuclear charge and are more available for bonding. Since the 5f orbitals extend further from the nucleus, they can overlap more effectively with orbitals of other atoms, allowing 5f electrons to participate in bonding to a far greater extent than 4f electrons. Statement R correctly explains statement A.
JEE Main · 2023 · 12 Apr 2023 · Shift 1 · Single correct option