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For fluorine it is 2 s 2, 2 p 5, for chlorine 3 s 2, 3 p 5 for bromine 4 s 2, 4 p 5, and for iodine it is 5 s 2, 5 p 5. In short, all the halogens have 7 electrons at the outermost quantum level or 5 electrons in the outermost p orbitals.
It is obtained by electrolyzing a solution of potassium hydrogen fluoride in anhydrous hydrogen fluoride in container of transparent fluorspar or metal. Element Classification: Halogen. Isotopes: Fluorine has 17 known isotopes ranging from F-15 to F-31. F-19 is the only stable and most common isotope of fluorine.