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Class 11 Chemistry - Bohr’s Model Of The Atom Chemistry notes for class 11: Bohr Atomic Model An atom is made up of three particles – electrons, protons, and Electrons have a negative charge and protons have a positive charge whereas neutrons have no charge. They are neutral. Due to the presence of an equal number of negative electrons and positive protons, the  atom as a whole is electrically neutral. The protons and electrons are located in a small nucleus at the center of the atom. Due to the presence of protons, the nucleus is positively charged. The electrons revolve rapidly around the nucleus in  fixed circular paths called energy levels or shells . The ‘energy levels’ or ‘shells’ or ‘orbits’ are represented in two ways: either by the numbers 1, 2, 3, 4, 5 and 6 or by letters K, L, M, N, O, and The energy levels are counted from the centre outwards. Arrangement of orbits around the nucleus Each energy level is associated with a fixed amount of energy. The energy