In 1912 Bohr joined Rutherford. He realized that Rutherford's model wasn't quite right. By all rules of classical physics, it should be very unstable. For one thing, the orbiting electrons should ...

In 1913, Niels Bohr revised Rutherford's model by suggesting that the electrons ... of the atom and the atomic mass. Bohr and other scientists knew that there also had to be a neutral particle ...

These particles should have passed straight through, according to the plum pudding model. However, many of them changed direction. Ernest Rutherford explained these results in his ‘planetary ...