Final answer:
Chlorine contains 17 electrons in its atom and can form a chloride ion with 18 electrons and a 1- charge.
Explanation:
Chlorine has 17 electrons arranged in different energy levels: 2 in the first, 8 in the second, and 7 in the third shell. By gaining one more electron, it forms a chloride ion with 18 electrons and a 1- charge.
Learn more about Number of electrons in a chlorine atom and ion here:
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