Which of the following general electronic configurations accurately defines the ground state for ele — d and f Block Elements Chemistry Question

💡 Solution & Explanation

The actinoid series constitutes the progressive filling of the $5f$ subshell. The core is Radon ($[Rn]$). Because the energy difference between the $5f$ and $6d$ orbitals is minuscule, there are frequent anomalies where an electron may reside in the $6d$ orbital instead of the $5f$. Thus, the strictly accepted general configuration is $[Rn] 5f^{1-14} 6d^{0-1} 7s^2$.