Which of the following halogen's does always show oxidation state is
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As halogen are also known as group 17 elements and all the elements present in this group have 7 valence electrons.
Therefore, each element of this group needs to gain one electron in order to complete its octet.
As we known that when a neutral atom gain an electron then it shows an oxidation state or charge of -1.
Since, F, Cl, Br, and I are all elements of halogen group and needs to gain one electron to completely fill its orbital.
Therefore, we can conclude that F, Cl, Br and I all show an oxidation state of -1.
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