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Can someone explain to me if the formation a cation from an atom in the gas phase is an endothermic or exothermic reaction? I saw this on the Internet while studying for my test and now I am thoroughly confused.
The formation of a cation from an atom is endothermic because to form the cation, an electron must be removed from the atom. To do this, one of the valence electrons must be excited to the point where it can break free from the pull of nucleus, requiring an input of energy to reach this excited state, indicating it's endothermic.
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