we should then expect a regular increase from 0 to 5, or no valency at all. No atomic model, so far as I know, has succeeded in making this difference plausible; but it is not essential to the ...

In 1913, Niels Bohr revised Rutherford's model by suggesting that the electrons ... However, there was still a difference between the atomic number of the atom and the atomic mass.

He suggested that an atom was a tiny solid ball. He published his ideas in 1803. This atomic model has changed over time. Scientists used the model to make predictions. Sometimes the results of ...