# How do you arrange the following sublevels in order of decreasing energy: 3s, 3d, and 3p?

$\text{3d}$, $\text{3p}$, $\text{3s}$
The diagram below shows the energy of each sublevel relative to one another. Notice also that all $\text{s}$, $\text{p}$, $\text{d}$, and $\text{f}$ sublevels have the same number of orbitals and the orbitals have the same amount of energy.