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n the Bohr model of an atom (shown), protons are represented in blue, the neutrons are red and the electrons are green. Use your periodic table and determine which of the following atoms is represented by the Bohr model.

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Answer: B

Explanation: Valence electrons are the number of electrons out the outermost shell of the diagram. In this diagram, there is one valence electron. This means that it is highly reactive since the shell is not complete and needs other elements to be able to complete the outermost shell. If this model had a full outermost shell, then it would not be reactive (noble gases).

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