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MAKING A BOHR MODEL In 1913, Neils Bohr proposed his model of the atom. This pictured the atom as having a dense, positively charged nucleus and negatively charged electrons in specific orbits, also called energy levels or shells, around the nucleus. Because of its simplicity and general ability to explain chemical change, the Bohr model is still used today. In a Bohr model, the nucleus is drawn as a circle with the number of protons & neutrons written inside the circle. Then the electron orbits (a.k.a. energy levels or shells) are drawn around the nucleus. A dot is placed on each orbit to represent each electron present in the atom. For example, here is a Bohr model of the Neon atom. 10 P 10 N Energy Level 1 2 3 4 5 Neon has an atomic number of 10 and a Mass number of 20. This means there are 10 protons, 10 neutrons, and 10 electrons Maximum number of electrons 2 8 18 32 32