Fluoride is the ionic form of fluorine. Fluorides are organic and inorganic compounds containing the element fluorine. As a halogen, fluorine forms a monovalent ion (-1 charge). Fluoride forms a binary compound with another element or radical. Examples of fluoride compounds include hydrofluoric acid (HF), sodium fluoride (NaF) and calcium fluoride (CaF2), and uranium hexafluoride (UF6).
Aluminium fluoride is the inorganic compound with the formula AlF3. It can be prepared by treating aluminium hydroxide or aluminium metal with HF. As a solid, its structure resembles that of rhenium trioxide, ReO3, consisting of distorted AlF6 octahedra.
Barium fluoride (Baf2) is a chemical compound of barium and fluorine, also known as barium(ii) fluoride. It is a solid which can be a transparent crystal. It occurs in nature as the mineral frankdicksonite.
Chromium is mined as chromite (FeCr2O4) ore. About two-fifths of the chromite ores and concentrates in the world are produced in South Africa, while Kazakhstan, India, Russia, and Turkey are also substantial producers.Untapped chromite deposits are plentiful, but geographically concentrated in Kazakhstan and southern Africa.
Copper(II) fluoride is an inorganic compound with the chemical formula CuF2. It is a white, crystalline, hygroscopic solid. It has a rutile-type crystal structure similar to other fluorides of chemical formula MF2.
Iron (II) oxide adopts the cubic, rock salt structure, where iron atoms are octahedral coordinated by oxygen atoms and the oxygen atoms octahedral coordinated by iron atoms. The non-stoichiometry occurs because of the ease of oxidation of Fe¹¹ to Fe¹¹¹ effectively replacing a small portion of Fe¹¹ with two thirds their number of Fe¹¹¹ which take up tetrahedral positions in the close packed oxide lattice.
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