Which of the following general outer electronic configurations correctly identifies an element belon — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Actinides form the second inner transition series and are placed in the 7th period. They involve the progressive filling of the antipenultimate 5f subshell. Therefore, their general outer configuration is $(n-2)f^{1-14} (n-1)d^{0-1} ns^2$ where $n=7$, which equals $5f^{1-14} 6d^{0-1} 7s^2$.