S6

Question: One constant named after this scientist is the magnetic dipole moment of an electron, his namesake magneton. His namesake ratio, approximately equal to 1/137, is also called the fine structure constant, and is the ratio between the velocity of electrons orbiting a nucleus and the speed of light. His model of an atom included a liquid drop of protons and neutrons in the nucleus, and replaced the Rutherford model. For 10 points, name this Danish physicist whose atomic model more importantly was the first to propose that electrons were in shells orbiting the nucleus.

Niels Henrik David Bohr