Final answer:
Electrons that revolve around the nucleus in fixed orbits are also called photons.
Step-by-step explanation:
The electrons that revolve around the nucleus in fixed orbits are also called photons.
Electrons are negatively charged subatomic particles that occupy specific energy levels, or shells, around the nucleus of an atom. The concept of electrons revolving in fixed orbits was first proposed by Niels Bohr in his atomic model. These orbits, also known as electron shells, determine the chemical properties of an atom.
For example, in the atom of hydrogen, the electron revolves around the nucleus in its lowest energy orbit, called the first shell. In more complex atoms, electrons occupy several different energy levels.