Which subatomic particles exist in orbital energy levels, or shells?
electrons
ions
protons
neutrons

The correct answer among the choices given is the first option. Electron is the subatomic particle that exist in a orbital energy levels or shells. At the first energy level, the only orbital available for the electrons is the 1s while in other orbitals there are more than one type of orbital.

Iwould you figure it out but you don't have a picture or in your question as to what the physical property you're looking for is

The answer is celsius