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Examples of symmetrical pseudohalogen compounds (Ps−Ps, where Ps is a pseudohalogen) include cyanogen (CN) 2, thiocyanogen (SCN) 2 and hydrogen peroxide H 2 O 2. Another complex symmetrical pseudohalogen compound is dicobalt octacarbonyl, Co 2 (CO) 8. This substance can be considered as a dimer of the hypothetical cobalt tetracarbonyl, Co(CO) 4.
Hair analysis is, in mainstream scientific usage, the chemical analysis of a hair sample. The use of hair analysis in alternative medicine as a method of investigation to assist alternative diagnosis is controversial [ 235 ] [ 236 ] and its use in this manner has been opposed repeatedly by the AMA because of its unproven status and its ...
The pseudopotential is an attempt to replace the complicated effects of the motion of the core (i.e. non-valence) electrons of an atom and its nucleus with an effective potential, or pseudopotential, so that the Schrödinger equation contains a modified effective potential term instead of the Coulombic potential term for core electrons normally found in the Schrödinger equation.
Their chemistry is that of main group elements. [50] A 2003 survey of chemistry books showed that they were treated as either transition metals or main group elements on about a 50/50 basis. [ 6 ] [ n 5 ] The IUPAC Red Book notes that although the group 3−12 elements are commonly referred to as the transition elements, the group 12 elements ...
An example of this transformation is the science of chemistry, which traces its origins to the pseudoscientific or pre-scientific study of alchemy. The vast diversity in pseudosciences further complicates the history of science. Some modern pseudosciences, such as astrology and acupuncture, originated before the scientific era.
Origin of title phenomenon in crystallographic defects. Shown is a two-dimensional slice through a primitive cubic crystal system showing the regular square array of atoms on one face (open circles, o), and with these, places where atoms are missing from a regular site to create vacancies, displaced to an adjacent acceptable space to create a Frenkel pair, or substituted by a smaller or larger ...
At high pressure, materials such as sodium chloride (NaCl) in the presence of an excess of either chlorine or sodium were transformed into compounds "forbidden" by classical chemistry, such as Na 3 Cl and NaCl 3. Quantum mechanical calculations predict the possibility of other compounds, such as NaCl 7, Na 3 Cl 2 and Na 2 Cl. The materials are ...
The inert-pair effect is the tendency of the two electrons in the outermost atomic s-orbital to remain unshared in compounds of post-transition metals.The term inert-pair effect is often used in relation to the increasing stability of oxidation states that are two less than the group valency for the heavier elements of groups 13, 14, 15 and 16.