Here are a few questions about quantum mechanics (Bohr’s atomic model). 1. An electron is a particle revolving around the nucleus. So it should radiate energy (by classical mechanics). But if this energy comes from the orbital, it must finally become 0 and the electron must crash into the nucleus. Why does this not happen? 2. Why does the energy in the orbits remain constant? 3. During quantum jumping or an electron traveling between any 2 orbits, the electron must lose energy when it is between them in the atomic vacuum. Does this really happen?