Fluorine (F). Diagram of the nuclear composition,electron configuration,chemical data,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 (red) and 10 neutrons (orange). 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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Credit: | Science Photo Library / Clarivan, Carlos |
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