Final answer:
Fluorine becomes an ion by gaining an electron to form a stable octet arrangement, leading to the creation of fluoride ions with a charge of -1 through ionic bonding.
Explanation:
Fluorine becomes an ion by gaining one electron to achieve a stable octet electron arrangement. When fluorine gains an electron, it becomes a fluoride ion with a charge of -1, represented as F-. This process of gaining or losing electrons to achieve a stable electron configuration is known as ionic bonding.
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