Answer
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Step 1: Recall that a neutral fluorine atom has 9 electrons.
A fluorine ion (F<sup>-</sup>) is formed when a fluorine atom gains an additional electron through a chemical reaction. The number of electrons in a fluorine ion is equal to the number of electrons in a neutral fluorine atom plus one.
Step 2: Calculate the number of electrons in a fluorine ion.
Number of electrons in a fluorine ion = Number of electrons in a neutral fluorine atom + 1 = 9 + 1 = 10
Final Answer
A fluorine ion (F<sup>-</sup>) has 10 electrons.
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