Most common is -1.
But halogens (except fluorine) are known to exhibit oxidation numbers upto +7 in their compounds.
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The oxidation number of halogens is typically -1 when they are in compounds. This is because halogens tend to gain one electron to achieve a full outer shell, resulting in a negative charge.
Halogens typically have an oxidation number of -1 in compounds because they have seven valence electrons and need to gain only one electron to achieve a full octet. Exception: in compounds with oxygen or other halogens, halogens may have positive oxidation numbers.
The halogens (group 17) have an oxidation number of -1, though the halogens below fluorine can have other oxidation numbers as well. Hydrogen can also have an oxidation number of -1 when it forms hydrides.
The common oxidation number for halogens is -1. This is because halogens have 7 electrons in their outer shell and tend to gain 1 electron to achieve a full valence shell, resulting in an oxidation number of -1.
The oxidation number of iodide is -1. Iodine is in Group 17 of the periodic table, commonly known as the halogens, which typically have an oxidation number of -1 when in ionic compounds.
The oxidation states of halogens can range from -1 to +7. Fluorine typically has an oxidation state of -1, while the other halogens (chlorine, bromine, iodine) can have oxidation states from -1 to +7 depending on the compound and bonding.