Copper exists in a monoatomic form and can form a crystal lattice, but it can not be a molecule because it's an element.
What is copper?
Copper is an element that is found in metallic solids.
Copper is a single-atom metal.
The atomicity of an element refers to the number of atoms contained in its molecule.
Copper is monoatomic because it contains only one Cu atom.
It is a metal with a face-centered cubic crystal structure.
Thus, copper exists in a monatomic form, and in a lattice but not as molecules.
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