Fluorine forms which 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

Fluorine forms which ion?

Explanation:
Fluorine forms a negative ion because it needs one more electron to fill its outer shell. It has seven electrons in that shell, so gaining one electron gives a stable octet, producing the fluoride ion with a -1 charge. Losing electrons to become a positive ion would be energetically unfavorable for fluorine, and gaining two electrons is also much less favorable than gaining just one. Since the neutral atom isn’t an ion, the form fluorine most readily takes is F−.

Fluorine forms a negative ion because it needs one more electron to fill its outer shell. It has seven electrons in that shell, so gaining one electron gives a stable octet, producing the fluoride ion with a -1 charge. Losing electrons to become a positive ion would be energetically unfavorable for fluorine, and gaining two electrons is also much less favorable than gaining just one. Since the neutral atom isn’t an ion, the form fluorine most readily takes is F−.

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