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The Bohr model was developed by Niels Bohr as a way of explaining the behavior of the electron and its interactions with energy.
Bohr used hydrogen in his model because it only has one electron. This model was successful for hydrogen, but not for other atoms; the differences in shape and energy made it impossible to create a perfect model for any atom other than hydrogen. Thus, it's important to remember that the Bohr model isn't a perfectly accurate model for non-hydrogen atoms, but its simplicity makes it an easy way to get the general picture and visualize the atom's structure.
In Bohr's system, the nucleus is surrounded by concentric shells, or orbits, that the electrons are locked into, just like the orbits of a planet. Each shell is a different level; level 1 is closest to the atom, level 2 is outside of level 1, and so on. As the levels increase in number, they increase in size as well as distance from the nucleus, allowing them to hold more electrons.
To draw a Bohr model for these atoms, start by drawing the nucleus (include the number of protons and neutrons as indicated in the sheet). Then, we're going to assume that you have just as many electrons as you have protons. Carbon, for example, will have 6. We need to put these electrons into the circles (energy levels).
The energy levels go as follows;
Level 1 can hold 2 electrons
Level 2 can hold 8 electrons
Level 3 and 4 can hold 8 electrons (actually they can hold more, but we're being simple in this case).
So, you draw a series of circles that get progressively larger, and fill them up with the number of electrons that you have.
Carbon will have two circles; the inner circle will have two dots, for the electrons, and the outer circle will have 4. I've attached a picture of the model, as well as a helpful video that shows how to do this model for Potassium (K).
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