Diagram of the nuclear composition, electron configuration, and valence orbitals of an atom of iodine-127 (atomic number: 53), the most common isotope
Diagram of the nuclear composition, electron configuration, and valence orbitals of an atom of iodine-127 (atomic number: 53), the most common isotope of this element. The nucleus consists of 53 protons (blue) and 74 neutrons (red). The stability of an element's outer (valence) electrons determines its chemical and physical properties. Iodine, present in thyroid hormones and some seaweeds, is a halogen in group 17, period 5, and the p-block of the periodic table. In elemental form it is a blue-black solid (I2) that melts at 113 degrees Celsius.
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Photo credit: © CARLOS CLARIVAN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
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