1. MgCl2 Magnesium Chloride : MgCl2 is an ionic solid. The bonding present in this compound is ionic bonding, which occurs between a metal Mg and a non-metal Cl . Magnesium loses two electrons to form a Mg2+ cation, while each chlorine atom gains one electron to form Cl- anions. The electrostatic attraction between the positively charged Mg2+ cations and the negatively charged Cl- anions holds the compound together in a crystal lattice structure.2. SiC Silicon Carbide : SiC is a covalent solid. The bonding present in this compound is covalent bonding, which occurs between two non-metals Si and C . Both silicon and carbon have similar electronegativities, so they share electrons to form strong covalent bonds. In silicon carbide, each silicon atom is bonded to four carbon atoms, and each carbon atom is bonded to four silicon atoms, forming a three-dimensional network structure.3. Cu Copper : Copper is a metallic solid. The bonding present in this compound is metallic bonding, which occurs between metal atoms. In metallic bonding, the valence electrons of the metal atoms are delocalized and form a "sea of electrons" that can move freely throughout the metal lattice. These delocalized electrons create a strong bond between the positively charged metal cations Cu+ , holding them together in a crystal lattice structure.