RICHARD KAIL / SCIENCE PHOTO LIBRARY RICHARD KAIL / SCIENCE PHOTO LIBRARY
Nickel atom. This is the most common and stable form for atoms of the metal nickel (atomic number 28). The nucleus (centre) contains 28 protons and 31 neutrons. Orbiting the nucleus are 28 electrons in four successive shells, with the configuration sometimes written as 2, 8, 16, 2. Nickel is most often used in alloys with other metals.
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