Question
Chemistry Question on Some Applications of d- and f-Block Elements
4f2 electronic configuration is found in
A
Pr
B
Pr3+
C
Nd3+
D
Pm3+
Answer
Pr3+
Explanation
Solution
The electronic configuration 4f2 corresponds to the configuration of the Pr 3+ ion, which is the ionized form of the element praseodymium (Pr). When an atom loses three electrons to become Pr 3+, its electronic configuration changes. The loss of three electrons from the neutral praseodymium atom's electronic configuration of 4 f 35 d 06 s 2 results in the 4 f 2 configuration for the Pr 3+ ion.
The correct answer is option (B) : Pr3+