Because of the large number of strong covalent bonds linking the whole structure

Mixture of two or more metals or a metal with a non-metal.

Giant ionic Structures

because the forces between the molecules are weak van der Waals’ forces

Due to the strong attractive forces between the metal ionsand the delocalised electrons.

Yes it does

Hard, brittle, high mp and bp, soluble in water, conduct electricity in molten and aqueous state

Zinc ions are larger than copper ions that makes the arrangement of the lattice less regular. This stops the layers of ions from sliding over each other

the presence of ions that are free to move to conduct electricity

in a metallic bond, the attractive forces act in all directions. When the layers slide, new metallic bonds are easily re-formed between ions in new lattice pos

regularly repeating arrangement of ions, atoms or molecules

The delocalised electrons that are free to move to conduct electricity