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He is considered an inert gas because it has 2 electrons in the s orbital. Therefore adding electrons to its shell is not favorable while fluorine desperately wants to fill the p-orbital/is about to complete its octet.
Helium is a noble gas, so it does not want more electrons as its valence shell is already full. Fluorine, on the other hand, is a halogen, and only needs one more electron to form an octet. Thus, it has the higher electronegativity.
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