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Metal halides are compounds between metals and halogens. Some, such as sodium chloride are ionic , while others are covalently bonded . A few metal halides are discrete molecules, such as uranium hexafluoride , but most adopt polymeric structures, such as palladium chloride .
The common halide anions are fluoride (F −), chloride (Cl −), bromide (Br −), and iodide (I −). Such ions are present in many ionic halide salts. Halide minerals contain halides. All these halide anions are colorless. Halides also form covalent bonds, examples being colorless TiF 4, colorless TiCl 4, orange TiBr 4, and brown TiI 4.
Alkali metal halides, or alkali halides, are the family of inorganic compounds with the chemical formula MX, where M is an alkali metal and X is a halogen. These compounds are the often commercially significant sources of these metals and halides. The best known of these compounds is sodium chloride, table salt. [1]
Metal halides are compounds between metals and halogens. Some, such as sodium chloride are ionic , while others such as uranium hexafluoride have considerable covalent character to their bonding. This category serves as a complement to Category:Nonmetal halides
Ionic radius, r ion, is the radius ... especially of the transition metals, ... For example, for crystals of group 1 halides with the sodium chloride structure, a ...
The complexation depends on halide ion numbers, atomic number of the alkali metal, the halide of which is added, temperature and solution ionic strength. [9] The tetrachloride is obtained upon dissolving the dioxide in hydrochloric acid; to prevent the exothermic decomposition, it is kept under concentrated sulfuric acid.
Metal silicides, silicon halides, and similar inorganic compounds can be prepared by directly reacting elemental silicon or silicon dioxide with stable metals or with halogens. Silanes, compounds of silicon and hydrogen, are often used as strong reducing agents, and can be prepared from aluminum–silicon alloys and hydrochloric acid.
When light is incident on the silver halide grain surface, a photoelectron is generated when a halide loses its electron to the conduction band: [2] [3] [10] X − + hν → X + e − . After the electron is released, it will combine with an interstitial Ag i + to create a silver metal atom Ag i 0: [2] [3] [10] e − + Ag i + → Ag i 0