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Which of the following statements BEST explains the difference in melting points between $MgO$ (2852$^o$C) and $NaF$ (1819$^o$C)?
Sodium, being an alkali metal, is more reactive than magnesium, an alkaline earth metal.
Magnesium and oxygen have higher charge values and therefore have greater Coulombic attractions.
Fluorine is more electronegative than oxygen.
The oxide ion is larger than the fluoride ion.