SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Mercury (Hg). Diagram of the nuclear composition and electron configuration of an atom of mercury-202 (atomic number: 80), the most common isotope of this element. The nucleus consists of 80 protons (red) and 122 neutrons (blue). Mercury is a transition metal in group 12, period 6, and the d-block of the periodic table. It is the only metal to be liquid at room temperature, freezing at minus 39 degrees Celsius. This is because the d-subshell shielding effect ends. It is a toxic metal, used in thermometers, barometers and manometers.
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