When exploring why aluminium oxide (Al₂O₃) boasts such a high melting point , we’re diving into the heart of atomic interactions, crystal structures, and chemical stability. With a melting point of around 2072°C (3762°F) , this compound doesn’t break down easily—and there’s a scientific story behind that strength. From ionic bonding to electrostatic forces and lattice enthalpy , aluminium oxide is a case study in molecular resilience. Let’s unravel this mystery from different scientific angles to discover why this white, powdery compound refuses to melt under pressure. ⚛️ Ionic Bonding : A Strong Atomic Glue The primary reason for the high melting point of aluminium oxide lies in the nature of its ionic bonds . Aluminium (Al³⁺) donates electrons to oxygen (O²⁻), forming a crystal composed of oppositely charged ions . These electrostatic attractions between positive and negative ions are incredibly strong. But there’s more to it: aluminium has a +3 charge , and oxygen has a -2...