The correct sequence for filling of electrons if the principal quantum number is will be: — Atomic Structure Chemistry Question

💡 Solution & Explanation

According to the Aufbau principle and the Moeller diagram, after filling the $6s$ orbital, electrons enter the $(n-2)f \to (n-1)d \to np$ sequence. Thus, it is $6s \to 4f \to 5d \to 6p$.