Bohr proposed adding to the model the new idea of quanta put forth by Max Planck in 1901. That way, electrons existed at set levels of energy, that is, at fixed distances from the nucleus.

Photo: Niels Bohr's research notes for his new atomic theory Rutherford's find came from a very strange experience. Everyone at that time imagined the atom as a "plum pudding." That is ...

In Bohr's model, if an electron orbit is not already filled, then it's easier for the atoms to exchange or share those ...

When an electron dropped from a high-energy orbit to a lower-energy one, it gave out light with an energy equal to the ...

To begin with, there’s no single quantum theory. There’s quantum mechanics, the basic mathematical framework that underpins it all, which was first developed in the 1920s by Niels Bohr ...

In 1913, Niels Bohr revised Rutherford's model by suggesting that the electrons orbited the nucleus in different energy levels or at specific distances from the nucleus. By doing this, he was able ...

Standard quantum theory as developed by the likes of Niels Bohr and Werner Heisenberg in the 1920s is fine for describing the workings of individual particles in isolation and at slow speeds.

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