The first electron affinity of an atom

I've read that the first electron affinity is always negative, meaning that energy is always released upon the addition of this first electron. However, I don't think this will apply to noble gases. Will adding an electron to a noble gas release energy?


Could someone please clarify electron affinity?


Edit: Even though there are no stable negative ions of noble gases. I assume it is still possible to add an electron. Yet it would require energy. Is this true, meaning the affinity is positive?


