On the bonding of aluminum fluoride
The bonding of male matter is related to its properties, ionic and covalent genera, and scholars must study it. Today, taking aluminum fluoride as the theory, what is its bonding.

Looking at the properties of elements, aluminum is a metal, and its outer layer has a small number of electrons, which is easy to lose electrons and form cations. Fluoride is a non-metal with high electronegativity, and it is easy to obtain electrons and form anions.

Looking at the difference in electronegativity, if the difference in electronegativity is large, it tends to ionic bonds. The difference in electronegativity between aluminum and fluoride is significant, which is one of the evidence of ionic bonding of aluminum fluoride.

Furthermore, in terms of crystal structure, ionic compounds often have higher melting points and boiling points, due to their strong ionic bonding force. The melting point of aluminum fluoride is quite high, which is also a sign of ionic compounds, which seems to prove that it is ionic bonding.

However, covalent is also discussed. Although aluminum is a metal, its ionic polarization ability is not weak. Fluoride ions have a small radius and are easily deformed by polarization. When the polarization reaches a certain degree, the electron cloud overlaps or has covalent components.

But in summary, ionic bonds dominate in aluminum fluoride. Its bonding properties are mostly determined by the nature of elements, poor electronegativity and crystal characteristics. Although there may be trace amounts of covalent components, ionic bonds are necessary, which is a break in the bonding of aluminum fluoride.