Bohr said that only certain orbits of definite energy are allowed inside the atom. He said that the electrons in their ground state do not emit radiation and that they will emit radiation when they fall from higher energy levels to lower energy levels. My question is what does orbits with definite energy mean? and why do the electron in their ground state not emit radiation?
Answer
what does orbits with definite energy mean?
It means that each orbit has an amount of energy associated with it. If you move between 2 orbits, it requires a certain amount of energy. It will be the same amount of energy for the same transition in the same atoms. Different transitions have different amounts of energy and different atoms have different orbits (resulting in different energies).
why do the electron in their ground state not emit radiation?
The ground state is defined as when all the electrons are in the lowest energy configuration for the atom (or ion). Electrons emit radiation (photons) when they drop down in energy levels in the atom. If the electrons are in the ground state, they cannot drop lower in energy, thus emitting a photon.
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