Ionic, covalent and metallic bonding

Use this to find an ionic compound’s formula from the charges of its ions: Mg²⁺ with Cl⁻ is MgCl₂, Al³⁺ with O²⁻ is Al₂O₃.

Use this for metallic bonding: how many electrons a piece of aluminum shares among its ions.

Use this to tell whether a bond is nonpolar, polar covalent or ionic from the electronegativity difference.

Use this for “Which observation shows that a solid is an ionic compound?”

Use this for “What kind of bond holds magnesium oxide together?”