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CARLOS CLARIVAN / SCIENCE PHOTO LIBRARY CARLOS CLARIVAN / SCIENCE PHOTO LIBRARY
Diagram of the nuclear composition, electron configuration, and valence orbitals of an atom of fluorine-19 (atomic number: 9), the most common isotope of the element fluorine. The nucleus consists of 9 protons (blue) and 10 neutrons (red). Nine electrons (white) occupy available electron shells (rings). The stability of an element's outer (valence) electrons determines its chemical and physical properties. Fluorine is a halogen in group 17, period 2, and the p-block of the periodic table. In elemental form it is a reactive, extremely toxic gas (F2). It condenses into a yellow liquid at minus 188 degrees Celsius.
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