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Ratio of cation radius to anion radius
the ratio of the ionic radius of the positively charged cation to the ionic radius of the negatively charged anion in a cation-anion compound. Anions are
Cation-anion_radius_ratio
Rules to predict ionic compounds' crystal structures
pairs. The sum of the ionic radii determines the cation-anion distance, while the cation-anion radius ratio r + / r − {\displaystyle r_{+}/r_{-}} (or r c
Pauling's_rules
Radius of an atomic ion in crystals
were hard spheres with radii such that the sum of ionic radii of the cation and anion gives the distance between the ions in a crystal lattice. Ionic radii
Ionic_radius
Crystallographic system where the unit cell is in the shape of a cube
the radius ratio rule, this structure is more likely to be formed if the cation is somewhat smaller than the anion (a cation/anion radius ratio of 0
Cubic_crystal_system
Aqueous cation H3O+
the Eigen cation, which is a tetrahydrate, H3O+(H2O)3 the Zundel cation, which is a symmetric dihydrate, H+(H2O)2 and the Stoyanov cation, an expanded
Hydronium
Chemical compound involving ionic bonding
cation will be associated with loss of an anion, i.e. these defects come in pairs. Frenkel defects consist of a cation vacancy paired with a cation interstitial
Salt_(chemistry)
Laboratory technique to separate ions and polar molecules
of a protein. The two types of ion chromatography are anion-exchange and cation-exchange. Cation-exchange chromatography is used when the molecule of interest
Ion_chromatography
Subatomic particle with positive charge
approximately 1836 times the mass of an electron (the proton-to-electron mass ratio). Protons and neutrons, each with a mass of approximately one dalton, are
Proton
Ion of fluorine
Fluoride (/ˈflʊəraɪd, ˈflɔːr-/) is an inorganic, monatomic anion of fluorine, with the chemical formula F− (also written [F]− ), whose salts are typically
Fluoride
Measure of solvency/solution
the sum of anion and cation contributions but some can work out values for independent ions. For monoatomic ions, decreasing ionic radius shows decreasing
Hydration_number
Electrically neutral group of two or more atoms
electrovalence in contrast to covalence. In the simplest case, the cation is a metal atom and the anion is a nonmetal atom, but these ions can be of a more complicated
Molecule
Type of crystal structure
ideal cubic structure has the B cation in 6-fold coordination, surrounded by an octahedron of anions, and the A cation in 12-fold cuboctahedral coordination
Perovskite_(structure)
Chemical reaction between oppositely-charged ions in solution
Solvent-separated ion-pair Cation outer-sphere complex Contact ion-pair (CIP) Cation inner-sphere complex Ion pairs are formed when a cation and anion, which are present
Ion_association
Empty space between atoms in a crystal lattice
a radius 0.414 times the size of the atoms making up the lattice. An atom that fills this empty space could be larger than this ideal radius ratio, which
Interstitial_site
Chemical element with atomic number 7 (N)
occurs via [HONNO]− to nitrous oxide and the hydroxide anion. Hyponitrites (involving the N 2O2− 2 anion) are stable to reducing agents and more commonly act
Nitrogen
Group of highly reactive chemical elements
(1974). "Alkali anions. Preparation and crystal structure of a compound which contains the cryptated sodium cation and the sodium anion". J. Am. Chem.
Alkali_metal
Chemical compound
pertechnetate anion, TcO− 4 that has slightly distorted tetrahedron symmetry both at 296 K and at 100 K while the coordination polyhedron of the sodium cation is
Sodium_pertechnetate
Crystalline chemical element or compound formed by geologic processes
Coordination polyhedra are geometric representations of how a cation is surrounded by an anion. In mineralogy, coordination polyhedra are usually considered
Mineral
Properties and behavior of hydrated cations in aqueous solution
Some methods reveal properties of the cation directly, others reveal properties that depend on both cation and anion. Some methods supply information of
Metal ions in aqueous solution
Metal_ions_in_aqueous_solution
Class of semiconductor nanocrystals
absorption edge and emission wavelength by anion substitution, it was also observed that the A-site cation also affects both properties. This occurs as
Perovskite_nanocrystal
Magnesium end-member of olivine, a nesosilicate mineral
mainly composed of the anion SiO4−4 and the cation Mg2+ in a molar ratio 1:2. Silicon is the central atom in the SiO4−4 anion. Each oxygen atom is bonded
Forsterite
Chemical compound
Therefore, according to the radius ratio rule, cations in this polymorph will reach their largest apparent radius because the anion-cation distances are greatest
Rubidium_chloride
Factor used to determine the compatibility of an ion with a crystal structure
{\displaystyle t} ) is a dimensionless number that is calculated from the ratio of the ionic radii: In an ideal cubic perovskite structure, the lattice
Goldschmidt_tolerance_factor
Solvent interface of a solute
of molecules of solvent are involved in the solvation shell around anions and cations from a dissolved salt in a solvent. Metal ions in aqueous solutions
Solvation_shell
Oxide mineral
octahedrally coordinated and the radius ratio between the cations and the anions in armalcolite are at three to five ratio equaling 0.6 making the structure
Armalcolite
Theory of molecular orbitals by Erich Hückel
of aromatic systems with nucleophiles and electrophiles. The benzyl cation and anion serve as simple models for arenes with electron-withdrawing and electron-donating
Hückel_method
Polyatomic ion
heteropolyoxometalates are very similar but contain more than one metal cation. The oxides of d0 metals such as V2O5, MoO3, WO3 dissolve at high pH to
Polyoxometalate
Smallest unit of a chemical element
negative ion (or anion). Conversely, if it has more protons than electrons, it has a positive charge and is called a positive ion (or cation). The electrons
Atom
Chemical element with atomic number 35 (Br)
the cherry-red Br2+ cation. A few other bromine cations are known, namely the brown Br3+ and dark brown Br5+. The tribromide anion, Br3−, has also been
Bromine
Atom of the element hydrogen
instead a hydrogen atom gains a second electron, it becomes an anion. The hydrogen anion is written as "H–" and called hydride. The hydrogen atom has special
Hydrogen_atom
Chemical element with atomic number 1 (H)
atom, hydron for the cation, H+, hydride for the anion, and H-. The name proton is often used for the positively charged cation, but this is strictly
Hydrogen
Chemical element with atomic number 53 (I)
states, including iodide (I−), iodate (IO3−), and the various periodate anions. As the heaviest essential mineral nutrient, iodine is required for the
Iodine
Class of chemical compounds
is around 2×1013 cm−2. The diargon cation, Ar2+ has a binding energy of 1.29 eV (124 kJ mol-1). The triargon cation Ar3+ is linear, but has one Ar−Ar bond
Argon_compounds
Chemical mechanism of spontaneous passivation
and cations through the lattice migration of Schottky defects (paired anion/cation vacancies) or Frenkel defects (complete anion lattice with cation vacancies
Metal_oxide_adhesion
Molecular interface between a surface and a fluid
Interfacial DLs are most apparent in systems with a large surface-area-to-volume ratio, such as a colloid or porous bodies with particles or pores (respectively)
Double layer (surface science)
Double_layer_(surface_science)
Equation in Brownian motion
diffusivities in the expressions of electric ionic mobilities of the cations and anions from the expressions of the equivalent conductivity of an electrolyte
Einstein relation (kinetic theory)
Einstein_relation_(kinetic_theory)
Polymer consisting of repeating units of a coordination complex
polymer is an inorganic or organometallic polymer structure containing metal cation centers linked by ligands. More formally a coordination polymer is a coordination
Coordination_polymer
Research apparatus for particle physics
atomic nuclei by using anions (negatively charged ions), and then passing the beam through a thin foil to strip electrons off the anions inside the high voltage
Particle_accelerator
Chemical element with atomic number 17 (Cl)
pentafluoride. The trichloride anion, [Cl3]−, has also been characterised; it is analogous to triiodide. The blue [Cl4]+ cation is formed by oxidation of elemental
Chlorine
Nanotechnology
I {\displaystyle I} . For a nanochannel with perfect control over cation and anion, the selectivity is unity. For a nanochannel without ionic flow control
Nanofluidic_circuitry
Scientific study of matter's behavior and properties
or cation. When an atom gains an electron and thus has more electrons than protons, the atom is a negatively charged ion or anion. Cations and anions can
Chemistry
Chemical element with atomic number 54 (Xe)
acceptors and fluoride donors, forming salts that contain such cations as XeF+ and Xe2F3+, and anions such as XeF5−, XeF7−, and XeF82−. The green, paramagnetic
Xenon
Chemical element with atomic number 25 (Mn)
oxidation state +7 is represented by salts of the intensely purple permanganate anion MnO4−. Potassium permanganate is a commonly used laboratory reagent because
Manganese
Nutrient within the soil
"Phosphorus efficiency of plants. II. Significance of root radius, root hairs and cation-anion balance for phosphorus influx in seven plant species". Plant
Plant_nutrients_in_soil
Model describing the departures from ideality in solutions of electrolytes and plasmas
means that each cation is surrounded by a spherically symmetric cloud of other ions. The cloud has a net negative charge. Similarly each anion is surrounded
Debye–Hückel_theory
Chemical element with atomic number 42 (Mo)
metals, molybdenum shows little inclination to form a cation in aqueous solution, although the Mo3+ cation is known to form under carefully controlled conditions
Molybdenum
Constants that describe stability of coordination complexes
supramolecular complexes, such as host–guest complexes and complexes of anions. The stability constant(s) provide(s) the information required to calculate
Stability constants of complexes
Stability_constants_of_complexes
Chemical element with metallic and nonmetallic properties
with a cation"; Monconduit et al. who prepared the layer compound or phase Nb3GexTe6 (x ≃ 0.9), and reported that this contained a GeII cation; Richens
Metalloid
composed of more than one different cation or anion, or which upon hydrolysis forms two different cations and anions. 2. A salt that is a molecular combination
Glossary_of_chemistry_terms
Chemical element with atomic number 70 (Yb)
doi:10.1007/s11167-005-0530-6. S2CID 94642269. Hubicka H, Drobek D (1997). "Anion-Exchange Method for Separation of Ytterbium from Holmium and Erbium". Hydrometallurgy
Ytterbium
Number of atoms, molecules or ions bonded to a molecule or crystal
multiple bonds). For example, [Cr(NH3)2Cl2Br2]− has Cr3+ as its central cation, which has a coordination number of 6 and is described as hexacoordinate
Coordination_number
Electric potential difference between interior and exterior of a biological cell
involve calcium (Ca2+), which is a divalent cation that carries a double positive charge. The chloride anion (Cl−) plays a major role in the action potentials
Membrane_potential
Technique in analytical chemistry
time in cation exchange while an increase in pH reduces the retention time in anion exchange. By lowering the pH of the solvent in a cation exchange
High-performance liquid chromatography
High-performance_liquid_chromatography
Chemical element with atomic number 90 (Th)
been observed in a large metal cluster anion consisting of 12 bismuth atoms stabilised by a center thorium cation. This compound was shown to be surprisingly
Thorium
Chemical element with atomic number 13 (Al)
exists as the hexa-aqua cation [Al(H2O)6]3+, which has an approximate Ka of 10−5. Such solutions are acidic because this cation can act as a proton donor
Aluminium
Chemical element with atomic number 81 (Tl)
trifluorides, has the β−BiF3 structure and does not form the TlF4− complex anion in aqueous solution. The trichloride and tribromide disproportionate just
Thallium
Chemical element with atomic number 89 (Ac)
Actinium can then be separated from radium, with a ratio of about 100, using a low cross-linking cation exchange resin and nitric acid as eluant. 225Ac was
Actinium
Chemical element with atomic number 102 (No)
the process is complicated by the need to separate out the gold using anion-exchange chromatography before isolating the nobelium by elution from chromatographic
Nobelium
Type of rechargeable battery
ionic radius of Na+ (116 pm) is substantially larger than that of Fe2+ and Fe3+ (69–92 pm depending on the spin state), whereas the ionic radius of Li+
Sodium-ion_battery
Chemical element with atomic number 103 (Lr)
LrCl3 just as it is for LuCl3 and more generally all the LnCl3. The complex anion [Lr(C5H4SiMe3)3]− is expected to be stable with a configuration of 6d1 for
Lawrencium
because positively charged cations tend to move towards it. Contrast anode. cathode ray cation A positively charged ion. Contrast anion. celestial mechanics
Glossary_of_physics
Chemical element with atomic number 14 (Si)
prepare it and characterize it in pure form. Its oxides form a family of anions known as silicates. Its melting and boiling points of 1414 °C and 3265 °C
Silicon
Chemical element with atomic number 62 (Sm)
Samarium halides change their crystal structures when one type of halide anion is substituted for another, which is an uncommon behavior for most elements
Samarium
Alternative to silicon-based photovoltaics
monovalent cations and two adjacent lead halide sheets. There is typically an A’ organic cation, generally an aryl ammonium or alkyl cation, and a small
Perovskite_solar_cell
Chemical element with atomic number 78 (Pt)
to contain Pt2− anions. The "platinum Grignard" Pt(MgCl)2·nTHF conjecturally contains Pt2− as well. It is predicted that even the cation PtO42+ in which
Platinum
Chemical element with atomic number 4 (Be)
with the metal ion-hydrolysis reaction and mixed complexes with both the anion and the hydroxide ion are also formed. For example, derivatives of the cyclic
Beryllium
Class of extreme chemical compounds
sodium hydrohelide cation, HKHe+ potassium hydrohelide cation, HBeHe2+ beryllium hydrohelide cation, HMgHe2+ magnesium hydrohelide cation, and HCaHe2+ calcium
Helium_compounds
Chemical element with atomic number 79 (Au)
nitric acid and hydrochloric acid), forming a soluble tetrachloroaurate anion. Gold is insoluble in nitric acid alone, which dissolves silver and base
Gold
Chemical element with atomic number 5 (B)
(BF3) combines eagerly with fluoride sources to give the tetrafluoroborate anion, BF4−. Boron trifluoride is used in the petrochemical industry as a catalyst
Boron
Chemical element with atomic number 82 (Pb)
and the [Pb2Cl9]n5n− chain anion. Lead(II) sulfate is insoluble in water, like the sulfates of other heavy divalent cations. Lead(II) nitrate and lead(II)
Lead
Chemical element with atomic number 92 (U)
containing a polyatomic uranium-oxide anion, are generally not water-soluble. The interactions of carbonate anions with uranium(VI) cause the Pourbaix diagram
Uranium
Any chemical compound having at least one fluorine atom
result of its small size and high negative charge density, the fluoride anion is the "hardest" base (i.e., of low polarizability). As a part of a molecule
Fluorine_compounds
Formation of mineral deposits in the kidneys
intake ratio of 2:1. Alkaline (higher) pH favors formation of carbonate and phosphate calculi. For domestic ruminants, dietary cation: anion balance
Kidney_stone_disease
Chemical element with atomic number 47 (Ag)
the most important oxidation state for silver in complexes is +1. The Ag+ cation is diamagnetic, like its homologues Cu+ and Au+, as all three have closed-shell
Silver
Any of the fifteen lanthanides plus scandium and yttrium
which the cations form a face-centred cubic lattice and the anions sit inside the tetrahedra of cations), except that one-quarter of the anions (oxygen)
Rare-earth_element
Chemical element with atomic number 83 (Bi)
polyatomic cations and anions. In strongly acidic aqueous solution, the Bi3+ ion solvates to form Bi(H2O)3+8. As pH increases, the cations polymerize
Bismuth
Chemical element with atomic number 6 (C)
Thus, the carbon is bonded to five boron atoms and one hydrogen atom. The cation [(Ph3PAu)6C]2+ contains an octahedral carbon bound to six phosphine-gold
Carbon
Chemical element with atomic number 26 (Fe)
M.L. (1968). "Stabilization of the hexachloroferrate(III) anion by the methylammonium cation". Inorganic Chemistry. 7 (12): 2662–63. doi:10.1021/ic50070a047
Iron
American scientist and activist (1901–1994)
structures of ionic compounds. These rules concern (1) the ratio of cation radius to anion radius, (2) the electrostatic bond strength, (3) the sharing of
Linus_Pauling
Comparison of the properties of the three main categories in the periodic table
Polonium forms a sulfate Po(SO4)2. It has been suggested that the astatine cation forms a weak complex with sulfate ions in acidic solutions. Hydrogen forms
Properties of metals, metalloids and nonmetals
Properties_of_metals,_metalloids_and_nonmetals
Form of phototherapy
photosensitiser (Psen*), generating a photosensitiser radical anion (Psen•−) and a substrate radical cation (Subs•+). The majority of the radicals produced from
Photodynamic_therapy
Chemical element with atomic number 105 (Db)
confirmed the stability of the +5 state: Db(V) was shown to be extractable from cation‐exchange columns with α‐hydroxyisobutyrate, like the group 5 elements and
Dubnium
Chemical element with atomic number 9 (F)
chemical fluorine generation should be feasible since some metal fluoride anions have no stable neutral counterparts; their acidification potentially triggers
Fluorine
Chemical element with atomic number 48 (Cd)
aluminium chloride, forming the Cd2+2 cation as cadmium(I) tetrachloroaluminate, which is similar to the Hg2+2 cation in mercury(I) chloride. Cd + CdCl2
Cadmium
Chemical element with atomic number 15 (P)
previously. With metal cations, phosphate forms a variety of salts. These solids are polymeric, featuring P-O-M linkages. When the metal cation has a charge of
Phosphorus
Neuron communication by electric impulses
transporters, maintains the normal ratio of ion concentrations across the membrane. Calcium cations and chloride anions are involved in a few types of action
Action_potential
Crystal growth process relative to the substrate used as seed
structure of oxygen anions then the spacing between the nearest neighbour oxygen sites would be the same for both species. The radius of the oxygen ion
Epitaxy
Chemical element with atomic number 112 (Cn)
relativistic correlation study of spectroscopic constants in E112H and its cation". The Journal of Chemical Physics. 124 (22): 224302. arXiv:physics/0508024
Copernicium
Chemical element with atomic number 86 (Rn)
from targets during irradiation. Additionally, salts of the [RnF]+ cation with the anions SbF6−, TaF6−, and BiF6− are known. Radon is also oxidised by dioxygen
Radon
Chemical element with atomic number 16 (S)
Hong Sik; Han, Hyun Soo (1 July 2005). Production of Sulfur-35 by the Cation Exchange Process. 2005 autumn meeting of the KNS, Busan (Korea, Republic
Sulfur
electrovalence in contrast to covalence. In the simplest case, the cation is a metal atom and the anion is a nonmetal atom, but these ions can be of a more complex
Glossary_of_engineering:_A–L
Category of metallic elements
52 V for the Au3+/Au couple. The [Rg(H2O)2]+ cation is expected to be the softest among the metal cations. Due to relativistic stabilisation of the 7s
Post-transition_metal
F-block chemical elements
oxidation state +6, except for the AnO22+-type cations, form [AnO4]2−, [An2O7]2− and other complex anions. For example, uranium, neptunium and plutonium
Actinide
Chemical element with atomic number 45 (Rh)
Carbonyl Anions: Synthesis, Characterization, and Chemical Properties. Adv. Organomet. Chem, 1990, 31: 1-51. Rh(VII) is known in the RhO3+ cation, see Da
Rhodium
Chemical element with atomic number 113 (Nh)
with stoichiometry TlI3 is a thallium(I) compound involving the triiodide anion, I− 3. Hoffman, Darleane C.; Lee, Diana M.; Pershina, Valeria (2006). "Transactinides
Nihonium
Chemical element with atomic number 33 (As)
not ionic compounds containing the As3− ion as the formation of such an anion would be highly endothermic and even the group 1 arsenides have properties
Arsenic
Class of chemical substance
into the metal node through cation exchange; a previously-synthesized metal-organic framework is exposed to actinide cations, where the radionuclides are
Metal–organic_framework
Chemical element with atomic number 58 (Ce)
conditions due to the relative ease of complexation and hydrolysis with various anions, although +1.72 V is representative. Cerium is the only lanthanide which
Cerium
Chemical element with atomic number 30 (Zn)
zinc in molten ZnCl2. The [Zn2]2+ core would be analogous to the [Hg2]2+ cation present in mercury(I) compounds. The diamagnetic nature of the ion confirms
Zinc
Chemical substance not composed of simpler ones
atoms: metallic elements form simple cations, whereas nonmetallic elements (and weak metals) form simple anions and oxoanions. An exception is noble gases
Chemical_element
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CATION ANION-RADIUS-RATIO
CATION ANION-RADIUS-RATIO
CATION ANION-RADIUS-RATIO
CATION ANION-RADIUS-RATIO
CATION ANION-RADIUS-RATIO
CATION ANION-RADIUS-RATIO
CATION ANION-RADIUS-RATIO
CATION ANION-RADIUS-RATIO
CATION ANION-RADIUS-RATIO
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