What is the energy level for each subshell?
Each subshell around the nucleus has a specific energy level. The first subshell is labeled 's' and has only one orbital; the second subshell labeled 'p' has three orbitals; the third subshell is labeled 'd' and has five orbitals; and the fourth subshell, which is labeled 'f,' has seven orbitals. Each of the orbitals can hold two electrons.