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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.

Answer:  Electrons

Explanation: As given by Schrodinger that the probability of finding an electron in the given space is known as Orbital.

Thus the subatomic particles that exist in orbital energy levels or shells are electrons.

Electron has an charge of a negative unit. It was discovered by the scientist J.J.Thomson.

Atom consist of protons and neutrons that are present in the nucleus . Electrons revolve around the nucleus.