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. Bohr suggested the revolutionary idea that electrons "jump" between energy levels (orbits) in a quantum fashion, that, without ever exists in an in-between state. It was called the Bohr-Rutherford Model, because he used many ideas of Rutherford to complete his model.

The First Balkan War was in 1913.