* Electronegativity: Aluminum has an electronegativity of 1.61, while chlorine has an electronegativity of 3.16. This significant difference in electronegativity means chlorine has a much stronger attraction for electrons.
* Electron Transfer: When aluminum and chlorine react, chlorine atoms gain electrons from aluminum atoms to achieve a stable octet configuration. This results in the formation of aluminum ions (Al3+) and chloride ions (Cl-).
* Electrostatic Attraction: The oppositely charged ions are then held together by strong electrostatic forces, forming an ionic bond.
Key Features of Ionic Bonds:
* Large electronegativity difference between elements
* Electron transfer from one atom to another
* Formation of positively charged cations and negatively charged anions
* Strong electrostatic attraction holding ions together
Key Features of Covalent Bonds:
* Similar or small electronegativity difference between elements
* Sharing of electrons between atoms
* Formation of molecules
In summary, due to the large electronegativity difference and electron transfer between aluminum and chlorine, the resulting bond in aluminum chloride is ionic, not covalent.
