How did Bohr prove that an atom must exist?
Answer: Doctor Neil Bohr in 1913 put forward the Bohr model of atom. This model fully explains the structure of atom and prove that atom must exist and it consists of basic fundamental particles. According to doctor Bohr model revolving electrons in an atom does not emit or absorb energy continuously and cannot fall into the nucleus.
Electrons can only emit or absorb energy, when they jumps from one orbit to the other. When they jumps from higher orbit to lower they emits energy and if jumps from lower to higher they absorbs energy. According to this model nucleus being the central point of the atom rounded in shape , attract the electrons in the circular shells of radius “r” and give each orbit and specifically to the atom a fixed shape. So an atom should exist and nor destroyed until any of the external factor (force) act on it. This is how Doctor Bohr prove that an atom should exist.