Noble gases such as Helium, Neon and Argon have an electron affinity nearly zero because they have octet configuration. Argon has all filled orbitals as well as a filled valence shell. As a result, it doesn’t want to lose or gain any electrons. Fluorine, Chlorine and Bromine belong to the Halogen group with electron affinity (inkJ/mol) of 328.0, 349.0, 324.6 respectively.
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