Question

The correct electronic configuration of Uranium (Z=92) is

• A. $[{Rn}] 5f^3 6d^1 7s^2$
• B. $[{Rn}] 5f^4 6d^0 7s^2$
• C. $[{Rn}] 5f^6 6d^3 7s^0$
• D. $[{Rn}] 5f^6 6d^1 7s^1$
• E. $[{Rn}] 5f^6 6d^1 7s^0$

Hint:

Actinides have partially filled $5f$ orbitals, which influence their chemical and physical properties.

Answer 1

The Correct Option is A

Step 1: Uranium (Z=92) belongs to the actinide series, and its electron configuration follows the Aufbau principle. 
Step 2: The electron configuration of uranium is: \[ [{Rn}] 5f^3 6d^1 7s^2 \] where: - Rn represents the radon core ($Z=86$). - The remaining six electrons occupy the $5f$, $6d$, and $7s$ orbitals. 
Step 3: The actinide elements tend to have electrons in both $f$ and $d$ orbitals due to energy level mixing. 
Step 4: Therefore, the correct answer is (A). \bigskip