An iodide ion is an iodine atom with a −1 (negative one) charge. Compounds with iodine in formal oxidation state −1 are called iodides. This can include ionic compounds such as caesium iodide or covalent compounds such as carbon tetraiodide. This is the same naming scheme as is seen with chlorides and bromides The chemical test for an iodide compound is to acidify the aqueous compound by adding some drops of acid, to dispell any carbonate ions present, then adding lead nitrate, yielding a bright yellow precipitate of lead iodide. // An ion is an atom, group of atoms, or subatomic particle with a net electric charge. ... General Name, Symbol, Number iodine, I, 53 Chemical series halogens Group, Period, Block 17, 5, p Appearance violet-dark gray, lustrous Atomic mass 126. ... Charge is a word with many different meanings. ... In chemistry, the oxidation state is a measure of the degree of oxidation of an atom in a chemical compound. ... // An ion is an atom, group of atoms, or subatomic particle with a net electric charge. ... Caesium iodide is an ionic compound often used as the input phosphor of an x-ray image intensifier tubes found in Fluoroscopy equipment. ... Covalent bonding is a form of chemical bonding characterized by the sharing of one or more pairs of electrons between atoms, in order to produce a mutual attraction, which holds the resultant molecule together. ... Carbon tetraiodide is CI4. ... The chloride ion is formed when the element chlorine picks up one electron to form an anion (negatively-charged ion) Cl−. The salts of hydrochloric acid HCl contain chloride ions and are also called chlorides. ... General Name, Symbol, Number bromine, Br, 35 Series halogens Group, Period, Block 17 (VIIA), 4, p Density, Hardness 3119 kg/m3 (300 K), NA Appearance Gas: red-brown solid: metallic luster Atomic properties Atomic weight 79. ... It has been suggested that strong acid be merged into this article or section. ... R/S statement R: , , , , S: , , , Flash point non-flammable RTECS number OG2100000 Supplementary data page Structure and properties n, εr, etc. ... Lead (II) iodide (PbI2) is a toxic, yellowish solid. ...

Examples

• hydrogen iodide (HI)
• sodium iodide (NaI)
• carbon tetraiodide (CI₄)
• silver iodide (AgI)