def METHOD_NAME():
    mol = mol3D()
    mol.addAtom(atom3D(Sym='Fe'))
    assert mol.natoms == 1
    assert mol.findMetal() == [0]
    mol.addAtom(atom3D(Sym='Cu'))
    assert mol.natoms == 2
    assert mol.findMetal() == [0, 1]
    mol.deleteatom(0)
    assert mol.natoms == 1
    assert mol.findMetal() == [0]