The Bohr model, introduced by Danish physicist Niels ... Dalton believed that every chemical element consisted of atoms of distinct properties that could be combined into various compounds ...

In 1912, Bohr was working for the Nobel laureate J.J. Thompson in England when he was introduced to Ernest Rutherford, whose discovery of the nucleus and development of an atomic model had earned ...

In 1912 Bohr joined Rutherford. He realized that Rutherford's model wasn't quite right ... to the periodic repetition of properties of the elements. The shells in which electrons orbit have ...