SCH3U1 // Notes // 1 - The Bohr Atomic Model & Atomic Energy Levels

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Chemistry - Notes - The Bohr Atomic Model & Atomic Energy Levels Bohr’s Observations & Conclusions Niels Bohr, a Danish scientist; experimented with applying electricity and thermal energy to hydrogen gas. He observed that the hydrogen atoms emitted light when they were “excited” by the additional energy. Bohr directed the light through a prism with a screen behind it. He observed lines of only certain colours of light. He realized that hydrogen, and conversely, every other element has a unique atomic spectrum: a pattern of coloured lines that is not produced by any other element. Bohr discovered that electrons orbit the nucleus of the atom in definite energy levels. As electrons jump from higher energy levels back down to lower energy levels, they emit light energy. The colours of light emitted by the excited hydrogen atoms correspond to the changes of energy that the electrons experience as they move between energy levels (Figure 8). Since he observed only certain colours, Bohr suggested that an atom has only certain specific energy levels. In Bohr’s model of the atom, each energy level can

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