Part B What electron sublevel starts to fill after completion of the \( 4 d \) sublevel? Submit Request Answer

After the completion of the \( 4d \) sublevel, electrons begin to fill the \( 5p \) sublevel. ### Explanation: The order in which electron sublevels are filled is governed by the **Aufbau principle**, which states that electrons occupy the lowest energy orbitals available. The typical order of filling can be visualized using the Aufbau diagram or by following the sequence based on increasing \( n + l \) values (where \( n \) is the principal quantum number and \( l \) is the azimuthal quantum number). Here's the sequence around the \( 4d \) sublevel: 1. **4d** (\( n = 4 \), \( l = 2 \)) 2. **5p** (\( n = 5 \), \( l = 1 \)) Following the \( 4d \) sublevel, electrons enter the \( 5p \) sublevel. ### Summary: **After the \( 4d \) sublevel is filled, the \( 5p \) sublevel begins to fill.**