Which of the following was not a contribution by Niels Bohr? Electrons are in orbits. There is a relationship between the outer shell and chemical properties. The charge of an electron. Quantum energy emissions.

Neil Bohr contributed towards science in many ways, but his contributions did not include the charge of an electron. Neil Bohr recognized a relationship between the chemical properties of a substance and the number of valence shell electrons. Moreover, he introduced the atomic model in 1913 and provided the liquid-drop model to explain nuclear fusion.