Crystallography‎ > ‎Molecular graphics‎ > ‎Pymol‎ > ‎

Place pseudo-atoms

pseudoatom Zn, elem=Zn, name=Zn, resn=Zn, resi=1

To create another Zinc with a different residue number:

pseudoatom Zn2, elem=Zn, name=Zn, resn=Zn, resi=z