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Iodide is one of the largest monatomic anions. It is assigned a radius of around 206 picometers. For comparison, the lighter halides are considerably smaller: bromide (196 pm), chloride (181 pm), and fluoride (133 pm). In part because of its size, iodide forms relatively weak bonds with most elements.
Cations are positively (+) charged ions while anions are negatively (−) charged. This can be remembered with the help of the following mnemonics. Cats have paws ⇔ Cations are pawsitive. [27] Ca+ion: The letter t in cation looks like a + (plus) sign. [28] An anion is a negative ion. (An egative ion ⇒ Anion). [29]
A cation is a positively charged ion with fewer electrons than protons [2] (e.g. K + (potassium ion)) while an anion is a negatively charged ion with more electrons than protons. [ 3 ] (e.g. Cl − (chloride ion) and OH − (hydroxide ion)).
Monatomic anions are named as the element modified with an -ide ending. The charge follows in brackets, (optional for 1−) e.g.: Cl − chloride(1−) or chloride; S 2− sulfide(2−) Some elements take their Latin name as the root e.g silver, Ag, argentide; copper, Cu, cupride; iron, Fe, ferride; tin, Sn, stannide
Fluoride (/ ˈ f l ʊər aɪ d, ˈ f l ɔːr-/) [3] is an inorganic, monatomic anion of fluorine, with the chemical formula F − (also written [F] −), whose salts are typically white or colorless.
The name of the cation (the unmodified element name for monatomic cations) comes first, followed by the name of the anion. [100] [101] For example, MgCl 2 is named magnesium chloride, and Na 2 SO 4 is named sodium sulfate (SO 2− 4, sulfate, is an example of a polyatomic ion).
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The nitride anion, N 3-ion, is very elusive but compounds of nitride are numerous, although rarely naturally occurring. Some nitrides have a found applications, [ 1 ] such as wear -resistant coatings (e.g., titanium nitride , TiN), hard ceramic materials (e.g., silicon nitride , Si 3 N 4 ), and semiconductors (e.g., gallium nitride , GaN).