Question

Why are the melting points of naf and mgo so different?

Answer 1

When the bond between magnesium and fluorine is being formed, the electrons must divide equally between the two fluorine atoms, giving each only one electron. When magnesium bonds with oxygen, the one oxygen atom gains both electrons, making it stronger. The greater the charge of ions that occurs during the formation of an ionic bond, the stronger the resulting bond this led the more melting point of MgO than NaF.

Answer 2

The NaF bond is stronger because it has a higher melting point of 993?C. ... ~ The oppositely charged ions in NaF are closer together and, therefore, form a stronger bond than the oppositely charged ions in NaI, which are farther apart and, therefore, form a weaker ionic bond.