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How to draw Bohr Diagrams

How to draw Bohr Diagrams: Bohr diagrams show electrons orbiting the nucleus of an atom somewhat like planets orbit around the sun. In the Bohr model, electrons are pictured as traveling in circles at different levels, depending on which element you have. (In real life, electrons do NOT travel in circles as pictured in Bohr Diagrams, but the diagrams are very useful for discussing certain aspects of chemical behavior, so we use them frequently for that purpose.) Here are some examples of Bohr diagrams: (These show the atoms lithium, fluorine and aluminum.)
Bohr diagrams of Lithium, Fluorine and Aluminum. Lithium has a +3 charge showing in its nucleus representing the 3 protons of lithium. Two of lithium's electrons are found in the first circle of the Bohr diagram, representing the first layer of electrons. Because the first layer of electrons is filled with only 2 electrons, the first circle is drawn with a solid line. The second circle, which is unfilled, contains 1 electron and is represented with a dotted line. Fluorine has 9 protons in its nucleus. The first circle is again solid with 2 electrons. The second circle is dotted with 7 electrons. A total of 9 electrons balances the 9 protons in the nucleus of fluorine. Aluminum has 13 protons and 13 electrons. The first two electrons are in the first circle, which is drawn with a solid line. The next circle is filled with 8 electrons (4 pairs) and is also drawn with a solid line. The third circle of aluminum is unfilled, containing only 3 electrons and is represented by a dotted line.
Drawing Bohr diagrams is REALLY EASY! You just have to know how to count.

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