Which one of the atoms shown would be most likely to form a cation with a charge of +1?

Name: Which one of the atoms shown would be most likely to form a cation with a charge of +1?
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Question

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In order to form a cation with a charge of +1, an atom must lose one electron. Among the given atoms, only atom A (sodium) has one valence electron and is most likely to lose it to form a cation with a charge of +1.

Which One of the Atoms Shown Would Be Most Likely