Some Applications Of D And F Block Elements

The electronic configuration 4f² corresponds to the ion Pr³⁺, which is derived from the element Praseodymium (Pr).

Neutral Praseodymium (Pr) has the atomic number 59, and its ground state electronic configuration is:

[Xe] 4f³ 6s²

When it forms the ion Pr³⁺, three electrons are removed. These are typically removed first from the outermost orbitals (6s and 4f):

• Two electrons from the 6s orbital
• One electron from the 4f orbital

This leaves the configuration as [Xe] 4f².

Therefore, the correct answer is option (B): Pr³⁺