In an ionic bond, one atom transfers electrons to another, typically occurring between a metal and a non-metal. Sodium (Na) is a metal that tends to lose one electron to achieve a stable electron configuration. The unknown element in the compound should be a non-metal that can gain an electron.
Among the options provided, A. fluorine (atomic number 9) is a non-metal that readily gains one electron to achieve a stable electron configuration, forming a stable compound with sodium: NaF (sodium fluoride).
Therefore, one possible choice for the other element in the compound is A. fluorine.
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