What do you understand by stationary states?

Explanation

According to Bohr's theory of hydrogen atom, electrons revolve around the nucleus is some fixed orbits and during its motion, the electron does not lose energy. For this reason, these orbitals are known as electronic orbitals at stationary states. When an electron stays in such an orbit, it does not remain stationary at all. had is been so, the electron, being attracted by the nucleus would have fallen onto the nucleus. the electron always remain in motion so as to overcome the influence of nuclear attractive force.