Question

$A{n}^{3+}$ (trivalent actinoid ions) have configuration

• A. $5f^{0}to5f^{14}$
• B. $5f^{1}to5f^{14}$
• C. $5f^{2}to5f^{14}$
• D. $5f^{0}to5f^{13}$

Answer 1

The correct option is B $5f^{1}to5f^{14}$

For $A{n}^{3+}$ the configuration is always $\left[Rn\right]5f^n$ where $nis1to14$.

The 5f binding energy is so great that remaining 5f electrons are regarded as "core-like" (i.e. incapable of modification by chemical means).