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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.
Fluorine is the most electronegative element. It has a charge of -1 and readily forms compounds. Original author unknown, Creative Commons License (Wikipedia). Anne Marie Helmenstine, Ph.D.ther highly electronegative elements are oxygen and chlorine. The element hydrogen does not have as high of an electronegativity because, although it has a half-filled shell, it readily loses an electron rather than gains one.