Chemistry - f-block Question with Solution | TestHub

Ion Configuration Unpaired Electron

Tb²⁺ $4f^9$ 5

Ce⁴⁺ [Xe] 0

Yb²⁺ $4f^{14}$ 0

Lu³⁺ $4f^{14}$ 0

Pr²⁺ $4f^3$ 3

Nd²⁺ $4f^4$ 4

Pm²⁺ $4f^5$ 5

Sm²⁺ $4f^6$ 6

Gd³⁺ $4f^7$ 7

Ce⁴⁺, Yb²⁺, and Lu³⁺ are diamagnetic due to the absence of unpaired electrons.