RICHARD WAREHAM FOTOGRAFIE / SCIENCE PHOTO LIBRARY RICHARD WAREHAM FOTOGRAFIE / SCIENCE PHOTO LIBRARY
Iodine. Chemical symbol, French name (iode), and values for the non-metal element iodine (I), a halogen that is present in thyroid hormones and some seaweeds. In elemental form it is a blue-black solid (I2) that melts at 113 degrees Celsius. Shown here are this chemical element's atomic number (53) and its standard atomic weight (126.904).
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