State the relative energies of s, p, d and f orbitals in a single energy level

In a single energy level, the relative energies of s, p, d, and f orbitals are as follows:

1. s orbital: This has the lowest energy level. In any given period, the s orbital is always the first to fill up because it requires the least amount of energy to do so.

2. p orbital: This has the next highest energy level after the s orbital. It fills up after the s orbital in any given period.

3. d orbital: This has a higher energy level than both the s and p orbitals. It starts to fill up in the 3rd period after the s and p orbitals have been filled.

4. f orbital: This has the highest energy level. It starts to fill up in the 4th period after the s, p, and d orbitals have been filled.

Please note that this is a simplified explanation. The actual order in which orbitals fill can be more complex due to factors such as electron-electron interactions and spin pairing energy.