Nickel (Ni) Periodic Table [Element Information & More] Nickel Transition Metal Ni Chemical Element Atomic Number 28 Nickel element from the periodic table series. Metallic icon set 3D Nickel Hanging Bell Domed. Substantial Cast aluminum bells feature a pair of metal spheres as clappers, and strung on a wire cord. A dome shaped bell of sand cast aluminum, paired with a triangular, polished oak sail oiled for weatherproofing. Choose from the nickel or antique brass finishes.