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Arguably Niels Bohr's greatest contribution to science is his gift of the modern-day atomic model. Bohr was the first scientist to discover that the number of electrons was the deciding factor in what properties an element would possess. He also is credited for the fact that electrons travel in their own unique orbits around a nucleus. His model later is adapted into quantum theory.
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Niels Bohr's investigation into the model of the atom, and the radiation that they emitted earned him a Nobel prize.
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Throughout this time frame, Bohr would debate heavily quantum theory with another famously known scientist Albert Einstein. Bohr's look on quantum theory showed that an electron could only be view as a wave, or as a particle. He also believed the results of experimentation relied heavily upon the tools and equipment used to carry them out. https://youtu.be/GhAn8xZQ-d8
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This theory would make way an understanding of today's nuclear fission.