It's Elemental: Nickel - Basic physical and historical information. ChemicalElements.com: Nickel - Basic information, atomic structure, and isotopes. USGS Minerals Information: Nickel - Statistics and information on the worldwide supply, demand, and flow of the element (PDF format). EnvironmentalChemistry.com: Nickel - Atomic structure, chemical and physical properties, and table of nuclides. Lenntech: Nickel - Physical data, chemical properties, health and environmental effects. Wikipedia: Nickel - Properties of the element, including its history, applications, and characteristics. Radiochemistry of Nickel - Full text of the monograph by L. J. Kirby (Hanford Atomic Products Operation, Richland, Washington). WebElements: Nickel - Extensive information on history, uses, occurrence, compounds, and properties of the element.