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Chlorine, atomic structure
Chlorine (Cl). Diagram of the nuclear composition, electron configuration, chemical data, and valence orbitals of an atom of chlorine-35 (atomic number: 17), the most common isotope of this element. The nucleus consists of 17 protons (red) and 18 neutrons (orange). 17 electrons (white) occupy available electron shells (rings). The stability of an element's outer (valence) electrons determines its chemical and physical properties. Vital to life in ionic form, chlorine is a halogen in group 17, period 3, and the p-block of the periodic table. In elemental form it is a yellow-green, reactive, toxic gas (Cl2) that liquefies at minus 34 degrees Celsius.
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