Early Models of Atom Were Highly Useful to Physics
The first proposal regarding the possible arrangement of positively and negatively charged particles in the atom was made by J. J. Thomson in 1907.
Atom
Useful Physics: Why Bohr’s Theory of Atom Was Revolutionary For its Time
In the hydrogen atom, there is a single electron that revolves around the nucleus in certain definite orbits, which are known as Stationary Orbits.