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Which element has the lowest first ionization energy?
Unsmiling
Displaying a serious or stern expression, without smiles.
Cheerful
Exhibiting a disposition that is full of joy and optimism.
Reflexive Smiling
An involuntary smile, often occurring in infants, that does not necessarily express happiness or response to social interactions.
Social
Relating to society or its organization; includes social interactions, structure, and function within human groups.
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