SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Tin (Sn). Diagram of the nuclear composition and electron configuration of an atom of tin-120 (atomic number: 50), the most common isotope of this element. The nucleus consists of 50 protons (red) and 70 neutrons (blue). The stability of an element's outer electrons determines its chemical and physical properties. Tin is a post-transition metal in group 14, period 5, and the p-block of the periodic table. It has a melting point of 231 degrees Celsius, and has been used since antiquity in alloys such as bronze. Modern uses include tin cans.
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