Which sublevels make up the 3rd energy level? s s,p

## Step 1<br />The energy levels in an atom are the main energy levels, also known as shells, where electrons reside. Each energy level is further divided into sublevels or subshells. These sublevels are named s, p, d, and f.<br /><br />## Step 2<br />The number of sublevels in an energy level is equal to the principal quantum number, which is the number of the energy level. For example, the first energy level has one sublevel (1s), the second energy level has two sublevels (2s and 2p), and so on.<br /><br />## Step 3<br />Following this pattern, the third energy level has three sublevels: 3s, 3p, and 3d.