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Phosphorus halide
In chemistry, there are three series of binary phosphorus halides, containing phosphorus in the oxidation states +5, +3 and +2. All compounds have been described, in varying degrees of detail, although serious doubts have been cast on the existence of PI5. Mixed chalcogen halides also exist. Oxidation state +5In the gas phase the phosphorus pentahalides have a trigonal bipyramidal molecular geometry as explained by VSEPR theory.
TribromideTribromide is the anion with the chemical formula Br−3, or salts containing it: Tetrabutylammonium tribromide Tetrabromophosphonium tribromide Pyridinium perbromide Sodium and potassium tribromides can be prepared by reacting NaBr or KBr with aqueous bromine.
FluorideNames IUPAC nameFluorideIdentifiers CAS Number16984-48-83D model (JSmol)Interactive imageChEBICHEBI:17051ChEMBLChEMBL1362ChemSpider26214Gmelin Reference14905 KEGGC00742MeSHFluoridePubChemCID28179UNIIQ80VPU408OInChIInChI=1S/FH/h1H/p-1Key: KRHYYFGTRYWZRS-UHFFFAOYSA-MSMILES[F-]Properties Chemical formulaFMolar mass18.998403163 g·mol Conjugate acidHydrogen fluorideThermochemistry Std molarentropy(S298)145.58 J/(mol⋅K) (gaseous) Std enthalpy offormation(ΔfH298)−333 kJ/mol Related compounds Other anionsChlorideBromideIodideExcept where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).Fluoride () is an inorganic, monatomicanion of fluorine, with the chemical formulaF (also written [F]), whose salts are typically white or colorless.
Trigonal bipyramidal molecular geometryIn chemistry, a trigonal bipyramid formation is a molecular geometry with one atom at the center and 5 more atoms at the corners of a triangular bipyramid. This is one geometry for which the bond angles surrounding the central atom are not identical (see also pentagonal bipyramid), because there is no geometrical arrangement with five terminal atoms in equivalent positions.
Fluxional moleculeFluxional (or non-rigid) molecules are molecules that undergo dynamics such that some or all of their nuclei interchange, or tunnel, between symmetrically equivalent positions. Because virtually all molecules are fluxional at some time scale, the term fluxional depends on the method used to assess the dynamics.
LigandIn coordination chemistry, a ligand is an ion or molecule with a functional group that binds to a central metal atom to form a coordination complex. The bonding with the metal generally involves formal donation of one or more of the ligand's electron pairs, often through Lewis bases. The nature of metal–ligand bonding can range from covalent to ionic. Furthermore, the metal–ligand bond order can range from one to three.Oxidation stateIn chemistry, the oxidation state, or oxidation number, is the hypothetical charge of an atom assuming all of its bonds to other atoms are fully ionic. It describes the degree of oxidation (loss of electrons) of an atom in a chemical compound. Conceptually, the oxidation state may be positive, negative or zero. In a binary compound like KCl, oxidation state of +1 for K implies it has donated an electron Cl, which will have an oxidation state of -1.
PhosphorusPhosphorus is a chemical element; it has symbol P and atomic number 15. All elemental forms of phosphorus are highly reactive and are therefore never found in nature. Elemental phosphorus can be prepared artificially, the two most common allotropes being white phosphorus and red phosphorus. With 31P as its only stable isotope, phosphorus has an occurrence in Earth's crust of about 0.1%, generally as phosphate rock.
VSEPR theoryValence shell electron pair repulsion (VSEPR) theory ( , ) is a model used in chemistry to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms. It is also named the Gillespie-Nyholm theory after its two main developers, Ronald Gillespie and Ronald Nyholm but it is also called the Sidgwick-Powell theory after earlier work by Nevil Sidgwick and Herbert Marcus Powell.TranshalogenationTranshalogenation is a substitution reaction in which the halide of a halide compound is exchanged for another halide.
Chalcogenpnictogens ← → halogensThe chalcogens (, ) are the chemical elements in group 16 of the periodic table. This group is also known as the oxygen family. Group 16 consists of the elements oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and the radioactive elements polonium (Po) and livermorium (Lv).
ChemistryScientific study of matter's behavior and propertiesImages relating to the six main branches of chemistry, clockwise from the upper left : a BeF₂ glass network (inorganic chemistry), a caffeine molecule (organic chemistry), a reaction coordinate diagram (physical chemistry), a proton NMR spectrum (analytical chemistry), the RGS4 protein (biochemistry), and a glowstick using chemiluminescence (applied chemistry).Chemistry is the scientific study of the properties and behavior of matter.
Lewis acids and basesA Lewis acid is a chemical species that contains an empty orbital which is capable of accepting an electron pair from a Lewis base to form a Lewis adduct. A Lewis base, then, is any species that has a filled orbital containing an electron pair which is not involved in bonding but may form a dative bond with a Lewis acid to form a Lewis adduct. For example, NH3 is a Lewis base, because it can donate its lone pair of electrons.
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