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

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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.**
After the $$ 4d $$ sublevel is filled, electrons start filling the $$ 5p $$ sublevel.

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

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