No, NaCl (sodium chloride) is not held together by metallic bonding. Instead, it is held together by ionic bonding.
Ionic bonding occurs when there is a transfer of electrons from one atom to another. In the case of sodium chloride, sodium (Na) donates an electron to chlorine (Cl). This transfer creates a sodium ion (Na+) and a chloride ion (Cl–). The resulting oppositely charged ions experience strong electrostatic forces of attraction, which hold them together in a crystalline structure.
In contrast, metallic bonding involves the sharing of free electrons among a lattice of metal atoms, which is not applicable in the case of NaCl. Therefore, while both ionic and metallic bonds are significant in chemistry, NaCl is a prime example of ionic bonding.