Niels Bohr perfected the atom model in 1913 in Copenhagen Denmark which was originally thought to be the atoms nucleus and a cloud of electrons around it. Bohr however thought that the atom would have a specific number of electrons orbiting around the nucleus. When he was a professor at Copenhagen University, Bohr also proposed the liquid droplet theory, which entails that electrons behave like a drop of water. The electron energy stems off of the nuclei and makes a dumbbell shape. When Bohr’s work was realized he won a Nobel prize in 1922.