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Which of the following assumptions made by Neils Bohr regarding the hydrogen atom was NOT new and "radical"?
Electrons are only stable in certain orbits.
Atoms only emit electromagnetic radiation when electrons transition to lower energy states.
The Coulomb force is responsible for keeping the electron in orbit around the positive nucleus.
An electron in a hydrogen atom can only orbit the nucleus if its angular momentum is some integer multiple of "h bar."
All of the above were new and "radical."