Fluorine finds it more energetically favorable to gain one electron rather than losing seven electrons due to the high energy required to remove seven electrons.
Why is it easier for fluorine to gain electrons rather than lose them to achieve a full outer shell?
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Fluorine has 7 valence electrons and needs only one more to achieve a full outer shell, making it easier to gain an electron rather than lose seven. This electron gain fills its outer shell, stabilizing its electron configuration.