Problem: Compare the electron affinity of fluorine to the ionization energy of sodium. Does the process of an electron being “pulled” from the sodium atom to the fluorine atom have a negative or a positive ΔE? Why is NaF a stable compound? Does the overall formation of NaF have a negative or a positive ΔE? How can this be?

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Compare the electron affinity of fluorine to the ionization energy of sodium. Does the process of an electron being “pulled” from the sodium atom to the fluorine atom have a negative or a positive ΔE? Why is NaF a stable compound? Does the overall formation of NaF have a negative or a positive ΔE? How can this be?