Which option is the fluoride ion?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Which option is the fluoride ion?

Explanation:
When atoms become ions, the charge shows how many electrons they’ve gained or lost. Fluorine has seven electrons in its outer shell, so it tends to gain one more to complete its octet. Gaining one electron gives fluorine a full outer shell and a negative charge, written as F−. That makes it the fluoride ion. The other options would either be a positively charged fluorine, a neutral fluorine atom, or a much less common -2 state, none of which describe the fluoride ion. So the fluoride ion is F−.

When atoms become ions, the charge shows how many electrons they’ve gained or lost. Fluorine has seven electrons in its outer shell, so it tends to gain one more to complete its octet. Gaining one electron gives fluorine a full outer shell and a negative charge, written as F−. That makes it the fluoride ion. The other options would either be a positively charged fluorine, a neutral fluorine atom, or a much less common -2 state, none of which describe the fluoride ion. So the fluoride ion is F−.

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