Iodine #1 Photograph by Science Photo Library

Iodine #1

by Science Photo Library

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Title

Iodine #1

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Science Photo Library

Medium

Photograph - Photograph

Description

Iodine (I). Diagram of the nuclear composition, electron configuration, chemical data, 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 (red) and 74 neutrons (orange). 53 electrons (white) successively occupy available electron shells (rings). 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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July 26th, 2016

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