Question

In bhors model of an atom it is said that electrons revevovle in discreet orbits in which they do not radiate energy so in the sub atomuc world physical laws are rejected

Answer 1

As long as the electron remain in the same shell no energy change takes place.
Energy is emitted or absorbed when anelectron jumps from a higher level to lower level or lower level to higher lever respectively.
According to Bohr's model, an electron would absorb energy in the form of photons to get excited to a higher energy level as long as the photon's energy was equal to the energy difference between the initial and final energy levels.
After jumping to the higher energy level—also called the excited state—the excited electron would be in a less stable position, so it would quickly emit a photon to relax back to a lower, more stable energy level.


it is not possible to know both a given electron’s position in space and its velocity at the same time, a concept that is more precisely stated in Heisenberg's uncertainty principle.
The uncertainty principle contradicts Bohr’s idea of electrons existing in specific orbits with a known velocity and radius. Instead, we can only calculate probabilities of finding electrons in a particular region of space around the nucleus.