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Bohr Model
A Bohr Model of an atom shows the number of protons, neutrons and electrons of an atom. This is a simple yet relatively accurate way to represent the atomic structure of an atom.
As can be seen in the Bohr Model, francium has only one valence electron, making it very reactive to other atoms.
Left: A Bohr Model of francium 223, the most common isotope of francium [4]
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