When sodium and fluorine combine to produce the compound NaF, the ions formed have the same electron configuration as atoms of Neon, only; option B.
Ions are formed when atoms gain or lose electrons
Sodium atom has 11 electrons and for sodium ions by losing one electron each to then have 10 electrons which is the number of electrons found in Neon atoms.
Fluoride ions are formed when fluorine atoms which have nine electrons gain an electron each to then have ten electrons which is the number of electrons in Neon atoms.
In the formation of NaF, sodium atoms donate one electron each to fluorine atoms so that both then have ten electrons each which is the number of electrons found in Neon atom.
Therefore, when sodium and fluorine combine to produce the compound NaF, the ions formed have the same electron configuration as atoms of Neon, only; option B.
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