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Encyclopedia > Cadmium iodide
Cadmium iodide
Cadmium iodide
Cadmium iodide
General
Systematic name cadmium(II) iodide
Other names cadmium iodide
cadmium diiodide
Chemical formula CdI2
Molar mass 366.20 g mol−1
Appearance white to pale yellow crystals
CAS number [10102-68-8]
Properties
Density and phase 5.640 g cm−3, solid
Solubility in water  ? g/100 ml (?°C)
Melting point 388°C (661 K)
Boiling point 787°C (1060 K)
Structure
Coordination
geometry
octahedral
Crystal structure rhombohedral
Dipole moment  ? D
Hazards
MSDS External MSDS
Main hazards  ?
NFPA 704

IUPAC nomenclature is a system of naming chemical compounds and of describing the science of chemistry in general. ... A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... Molar mass is the mass of one mole of a chemical element or chemical compound. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences, mixtures and alloys. ... Density (symbol: ρ - Greek: rho) is a measure of mass per volume. ... In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i. ... It has been suggested that Solid solubility be merged into this article or section. ... This article describes water from a scientific and technical perspective. ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ... The boiling point of a substance is the temperature at which it can change its state from a liquid to a gas throughout the bulk of the liquid at a given pressure. ... The coordination geometry of an atom is the geometrical pattern formed by its neighbors in a molecule or a crystal. ... Enargite crystals In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... In crystallography, the rhombohedral (or trigonal) crystal system is one of the 7 lattice point groups. ... // The Earths magnetic field, which is approximately a dipole. ... The debye (symbol: D) is a non-SI and non-CGS unit of electrical dipole moment. ... A material safety data sheet or MSDS is a form containing data regarding the properties of a particular substance. ... The examples and perspective in this article or section may not represent a worldwide view. ... NFPA 704 is a standard maintained by the U.S. National Fire Protection Association. ... Image File history File links NFPA_704. ...

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Supplementary data page
Structure and
properties
n, εr, etc.
Thermodynamic
data
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Related compounds
Other anions cadmium fluoride
cadmium chloride
cadmium bromide
Other cations zinc iodide
mercury(II) iodide
Except where noted otherwise, data are given for
materials in their standard state (at 25°C, 100 kPa)
Infobox disclaimer and references

Cadmium iodide, CdI2, is a chemical compound of cadmium and iodine. It is notable for its crystal structure, which is typical for compounds of the form MX2 with strong polarization effects. The refractive index (or index of refraction) of a material is the factor by which the phase velocity of electromagnetic radiation is slowed in that material, relative to its velocity in a vacuum. ... The dielectric constant εr (represented as or K in some cases) is defined as the ratio: where εs is the static permittivity of the material in question, and ε0 is the vacuum permittivity. ... Ultraviolet-Visible Spectroscopy or Ultraviolet-Visible Spectrophotometry (UV/ VIS) involves the spectroscopy of photons (spectrophotometry). ... IR spectrum of a thin film of liquid ethanol. ... Nuclear Magnetic Resonance Spectroscopy most commonly known as NMR Spectroscopy is the name given to the technique which exploits the magnetic properties of nuclei. ... Basic schematic of a mass spectrometer Mass spectrometry (also known as mass spectroscopy (deprecated)[1] or in common speech mass-spec) is an analytical technique used to measure the mass-to-charge ratio of ions. ... An ion is an atom or group of atoms that normally are electrically neutral and achieve their status as an ion by loss (or addition) of an electron. ... Cadmium fluoride has formula CdF2. ... Cadmium chloride is a white crystalline compound of cadmium and chlorine, with the formula CdCl2. ... An ion is an atom or group of atoms that normally are electrically neutral and achieve their status as an ion by loss (or addition) of an electron. ... Zinc iodide is composed of Zinc and Iodine. ... In chemistry, the standard state of a material is its state at 1 bar (100 kilopascals) and 25 degrees Celsius (298. ... General Name, Symbol, Number cadmium, Cd, 48 Chemical series transition metals Group, Period, Block 12, 5, d Appearance silvery gray metallic Atomic mass 112. ... General Name, Symbol, Number iodine, I, 53 Chemical series halogens Group, Period, Block 17, 5, p Appearance violet-dark gray, lustrous Atomic mass 126. ... Enargite crystals In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... A commonly-used example of a polar compound is water (H2O). ...

Contents

Crystal structure

Cadmium iodide forms crystals with hexagonal symmetry. The iodide anions form a hexagonal close packed arrangement while the cadmium cations fill alternating layers of octahedral sites. The resultant structure consists of a layered lattice. This same basic structure is found in many other salts and minerals. Cadmium iodide is mostly ionically bonded but with partial covalent character. Quartz crystal In chemistry and mineralogy, a crystal is a solid in which the constituent atoms, molecules, or ions are packed in a regularly ordered, repeating pattern extending in all three spatial dimensions. ... Sphere symmetry group o. ... An iodide ion is an iodine atom with a −1 (negative one) charge. ... An anion is an ion with negative charge. ... A cation is an ion with positive charge. ... A magnified crystal of a salt (halite/sodium chloride) In chemistry, a salt is any ionic compound composed of positively charged cations and negatively charged anions so that the product is neutral and without a net charge. ... Minerals are natural compounds formed through geological processes. ... Electron configurations of lithium and fluorine. ... Covalently bonded hydrogen and carbon in a molecule of methane. ...


Cadmium iodide's crystal structure is the prototype on which the crystal structures many other compounds can be considered to be based. Compounds with any of the following characteristics tend to adopt the CdI2 structure:

An iodide ion is an iodine atom with a −1 (negative one) charge. ... An ion is an atom or group of atoms that normally are electrically neutral and achieve their status as an ion by loss (or addition) of an electron. ... A bromide is a phrase, or person who uses phrases, which have been used and repeated so many times as to become either insincere in their meaning, or seem like an attempt at trying to explain the obvious. ... The chloride ion is formed when the element chlorine picks up one electron to form an anion (negatively-charged ion) Cl−. The salts of hydrochloric acid HCl contain chloride ions and are also called chlorides. ... Hydroxide is a polyatomic ion consisting of oxygen and hydrogen: OH− It has a charge of −1. ... The term sulfide (sulphide in British) refers to several types of chemical compounds containing sulfur in its lowest oxidation number of -2. ... The selenide ion is Se2-. A selenide is a chemical compound in which selenium serves as a anion with oxidation number of -2, much as sulfur does in a sulfide. ... Telluride is either: A compound of a metal with the element Tellurium. ... The chalcogens (with the ch pronounced with a hard c as in chemistry) are the name for the periodic table group 16 (old-style: VIB or VIA) in the periodic table. ...

Compounds with the CdI2 crystal structure

The iodide anions in CdI2 form a hexagonal close-packed structure, while the cadmium cations occupy some of the octahedral interstices
Enlarge
The iodide anions in CdI2 form a hexagonal close-packed structure, while the cadmium cations occupy some of the octahedral interstices

Iodides

MgI2, TiI2, VI2, MnI2, FeI2, CoI2, CaI2, PdI2, PbI2. Lead (II) iodide (PbI2) is a toxic, yellowish solid. ...


Chlorides and bromides

TiCl2, VCl2; Vanadium(II) chloride is VCl2. ...


MgBr2, TiBr2, VBr2, MnBr2, FeBr2, CoBr2.


Hydroxides of M2+

Mg(OH)2, Ni(OH)2, Ca(OH)2. Magnesium hydroxide, Mg(OH)2, otherwise known as milk of magnesia, is commonly used as an antacid or a laxative. ... Nickel(II) hydroxide (Ni(OH)2) is an insoluble compound commonly used in rechargable battery electrodes. ... Calcium hydroxide is a chemical compound with the chemical formula Ca(OH)2. ...


Chalcogenides of M4+

TiS2, ZrS2, SnS2, α-TaS2, PtS2;


TiSe2, ZrSe2, SnSe2, PtSe2;


SiTe2, TiTe2, CoTe2, NiTe2, PdTe2, PtTe2. Melonite, or nickel telluride, is a telluride of nickel; it is a metallic mineral. ...


Others

Ag2F, W2C. Silver(II) fluoride has formula AgF2. ... Tungsten carbide, WC, or W2C, is a chemical compound containing tungsten and carbon, similar to titanium carbide. ...


References

  1. N. N. Greenwood, A. Earnshaw, Chemistry of the Elements, 2nd ed., Butterworth-Heinemann, Oxford, UK, 1997.

External links

  • Link page to external chemical sources.

  Results from FactBites:
 
Cadmium - Wikipedia, the free encyclopedia (994 words)
Even though cadmium and its compounds are highly toxic, the British Pharmaceutical Codex from 1907 states that cadmium iodide was used as a medicine to treat "enlarged joints, scrofulous glands, and chilblains".
Consequently, cadmium is produced mainly as a byproduct from mining, smelting, and refining sulfide ores of zinc, and to a lesser degree, lead and copper.
Cadmium poisoning is the cause of the itai-itai disease, which literally means "pain pain" in Japanese.
Cadmium - LoveToKnow 1911 (1190 words)
Cadmium oxide, CdO, is a brown powder of specific gravity 6.5, which can be prepared by heating the metal in air or in oxygen; or by ignition of the nitrate or carbonate; by heating the metal to a white heat in a current of oxygen it is obtained as a dark red crystalline sublimate.
Cadmium salts can be recognized by the brown incrustation which is formed when they are heated on charcoal in the oxidizing flame of the blowpipe; and also by the yellow precipitate formed when sulphuretted hydrogen is passed though their acidified solutions.
Cadmium is estimated quantitatively by conversion into the oxide, being precipitated from boiling solutions by the addition of sodium carbonate, the carbonate thus formed passing into the oxide on ignition.
  More results at FactBites »

 
 

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