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Formalism used for classifying compounds
generally exist as free species. Two methods of electron counting are "neutral counting" and "ionic counting". Both approaches give the same result (and can
Electron_counting
Electron counting rules
In chemistry the polyhedral skeletal electron pair theory (PSEPT) provides electron counting rules useful for predicting the structures of clusters such
Polyhedral skeletal electron pair theory
Polyhedral_skeletal_electron_pair_theory
Diagrams for the bonding between atoms of a molecule and lone pairs of electrons
the need for electron counting: the atoms are drawn showing the valence electrons; bonds are then formed by pairing up valence electrons of the atoms
Lewis_structure
Description of the electron configuration
The d electron count or number of d electrons is a chemistry formalism used to describe the electron configuration of the valence electrons of a transition
D_electron_count
Chemical rule of thumb
strictly obey the 18-electron rule and the valence electron count can vary between 12 and 18. Lewis structure Electron counting Housecroft, Catherine
Octet_rule
Model for predicting molecular geometry
algebraic electron-counting formula. This method sums the relevant valence electrons and divides by 2 to determine the number of electron pairs (domains)
VSEPR_theory
German physicist (1882–1945)
(1928). "Elektronenzählrohr zur Messung schwächster Aktivitäten (Electron counting tube for the measurement of the weakest radioactivities)". Die Naturwissenschaften
Hans_Geiger
Destabilization of CO ligands that are cis to other ligands
ligand that donates 2 electrons to the complex, and therefore lacks anionic or cationic properties that would affect the electron count of the complex. For
Cis_effect
Electron in the outer shell of an atom's energy levels
In chemistry and physics, valence electrons are electrons in the outermost shell of an atom, and they can participate in the formation of a chemical bond
Valence_electron
Chemical notation
one electron to the metal and accept one electron from the metal when using the neutral ligand method of electron counting, or donate two electrons to
Covalent bond classification method
Covalent_bond_classification_method
Principal energy levels in atomic physics
related to Electron shell diagrams. Periodic table (electron configurations) Electron counting 18-electron rule Core charge Re: Why do electron shells have
Electron_shell
Chemical property of transition metals
fulfill the 18-electron rule when one considers only those valence electrons, which occupy metal–ligand bonding orbitals. Electron counting – Formalism used
18-electron_rule
one polyhedron. Electron-counting rules are used to predict the preferred electron count for molecules. The octet rule, the 18-electron rule, and Hückel's
Jemmis_mno_rules
Part of a Geiger counter
(1928). "Elektronenzählrohr zur Messung schwächster Aktivitäten" [Electron counting tube for measurement of weakest radioactivities]. Die Naturwissenschaften
Geiger–Müller_tube
Instrument used for measuring ionizing radiation
(1928), "Elektronenzählrohr zur Messung schwächster Aktivitäten" (Electron counting tube for the measurement of the weakest radioactivities), Die Naturwissenschaften
Geiger_counter
Elementary particle with negative charge
The electron (e− , or β− in nuclear reactions) is a subatomic particle whose electric charge is negative one elementary charge. It is an elementary particle
Electron
Electron diffraction using very short pulses
by an electron counting instrument such as a charge-coupled device camera or a direct electron detector similar to detection methods in electron microscopy
Ultrafast electron diffraction
Ultrafast_electron_diffraction
Imaging and diffraction using electrons that pass through samples
single electron counts ("counting mode"). These Direct Electron Detectors are available from Gatan, FEI, Quantum Detectors and Direct Electron. A TEM
Transmission electron microscopy
Transmission_electron_microscopy
Organic derivative of iodine
loosely termed the hypervalent organoiodines (strictly, this requires an electron count exceeding 8 around iodine and the presence of a carbon–iodine covalent
Hypervalent organoiodine compounds
Hypervalent_organoiodine_compounds
Study of organic compounds containing metal(s)
As in other areas of chemistry, electron counting is useful for organizing organometallic chemistry. The 18-electron rule is helpful in predicting the
Organometallic_chemistry
Octahedral clusters: Synthetic
total of 24 valence electrons, or 2e/Mo-Mo vector. More electron-deficient derivatives such as Ta6Cl184− have fewer d-electrons. For example, the naked
Octahedral_cluster
Chemical compound
and David Mazziotti of the University of Chicago. Olympicene has 18 pi electrons in its ring system; as it is a flat molecule, this makes it an aromatic
Olympicene
Mode of arrangement of electrons in different shells of an atom
In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure)
Electron_configuration
1956 nuclear physics experiment on weak force parity conservation
with the polarizing field oriented in the opposite direction. If the electron counting rates differed significantly for the two field orientations, there
Wu_experiment
Set of rules pertaining to pericyclic reactions
obey a single set of generalized selection rules, depending on the electron count and topology of the orbital interactions. The key concept of orbital
Woodward–Hoffmann_rules
equipped with a monochromator, an electron biprism, an electron energy-loss spectrometer and a direct electron counting detector. In situ and quantitative
Ernst_Ruska-Centre
Field of chemistry
begins with classifying molecules according to electron counting, focusing on the numbers of valence electrons, usually at the central atom in a molecule
Inorganic_chemistry
Form of electron microscopy
with low electron doses can enable single electron counting for high efficiency imaging. Additionally, MAPS detectors tend to have electron high sensitivities
4D scanning transmission electron microscopy
4D_scanning_transmission_electron_microscopy
Branch of seismology
Earthquake forecasting is a branch of the science of geophysics, primarily seismology, concerned with the probabilistic assessment of earthquake occurrence
Earthquake_forecasting
Chemical compound of a transition metal and nitric oxide
Co(NO)(CO)3 and Ni(CO)4 illustrate the analogy between NO+ and CO. In an electron-counting sense, two linear NO ligands are equivalent to three CO groups. This
Metal_nitrosyl_complex
sulfide, like water, is a 2-electron L-type ligand in the covalent bond classification method and the usual electron counting rules. An early and well-studied
Transition metal complexes of hydrogen sulfide and hydrosulfide
Transition_metal_complexes_of_hydrogen_sulfide_and_hydrosulfide
Identical electron configuration
sometimes be not as strict, sometimes requiring identity of the total electron count and with it the entire electronic configuration. More usually, definitions
Isoelectronicity
Chemical compound of sulfur and oxygen
approach that does not invoke d orbital participation. In terms of electron-counting formalism, the sulfur atom has an oxidation state of +4 and a formal
Sulfur_dioxide
Ion or molecule bound to a metal atom
ISBN 978-0321811059. Rasmussen, Seth C. (5 March 2015). "The 18-electron rule and electron counting in transition metal compounds: theory and application". ChemTexts
Ligand
Indian theoretical chemist
aromatic compounds, polyhedral boranes, carboranes, silaboranes, electron counting rules for polycondensation, and structure of boron allotropes. The
E._D._Jemmis
Topics referred to by the same term
D0 may refer to: d0, the d electron count of a transition metal complex D0 meson D0︀ experiment, at the Tevatron collider at Fermilab, in Batavia, Illinois
D0
Class of chemical compounds
the Covalent bond classification method. In the usual electron counting method, it is a two-electron ligand. Imidazole is classified as L ligand in the covalent
Transition metal imidazole complex
Transition_metal_imidazole_complex
Specialized technique for electron diffraction
individual electron counts can be interpreted. More recently, direct electron detectors have been successfully used in both linear and counting modes. In
Microcrystal electron diffraction
Microcrystal_electron_diffraction
1951 computer animation
frequency perfectly to hit the small hole in the floor. The film Making Electrons Count, believed to be from 1953, shows Bouncing Ball in action, with the
Bouncing Ball (computer program)
Bouncing_Ball_(computer_program)
Chemical element with atomic number 6 (C)
form up to four covalent bonds due to its valence shell exhibiting 4 electrons. It belongs to group 14 of the periodic table. Carbon makes up about 0
Carbon
Atom cluster that exhibits properties of elemental atoms
a closed shell of electrons, in this new counting scheme.[citation needed] Superhalogens are atom clusters with a higher electron affinity than chlorine
Superatom
Class of chemical compounds
the Covalent bond classification method. In the usual electron counting method, it is a two-electron ligand. Ammonia is also compact such that steric effects
Metal_ammine_complex
NASA satellite of the Explorer program
data were primarily useful in identifying proton contamination of electron counting rates. The instrument behaved well throughout the spacecraft life
Explorer_26
Chemical compound
is taken as a 10π electron donor, a 32 valence electron count may be obtained. In most triple-decker complexes with an electron count ranging from 26 to
Hexaphosphabenzene
Chemical compound
valence electrons, nickelocene has the highest electron count of the transition metal metallocenes. Cobaltocene, Co(C5H5)2, with only 19 valence electrons is
Nickelocene
scheme, serving as a 3e– donor using neutral electron counting and a 4e– donor using ionic electron counting. Characteristically, the central carbon binds
Transition metal allyl complex
Transition_metal_allyl_complex
Rule describing chemical reactions
complexes of 18 electron configuration tend to dissociate ligands or undergo reductive elimination: Rh(PPh3)3ClH2 → Rh(PPh3)3Cl + H2 Electron counting Tolman,
Tolman's_rule
classification method. In the usual electron counting method, it is a one-electron ligand when terminal and a three-electron ligand when doubly bridging. From
Transition metal hydroxide complexes
Transition_metal_hydroxide_complexes
Class of organometallic compounds
atom between two metal centers. From an electron counting perspective, the vinylidene counts for only one electron per metal center. From a molecular orbital
Transition metal vinylidene complex
Transition_metal_vinylidene_complex
Coordination complex of a metal and cyclopentadienyl groups
these complexes are referred to as π-complexes. Equivalent in an electron counting to η5-Cp anion are three CO ligands as well as scorpionate ligands
Cyclopentadienyl_complex
Molecule with a hydrogen bound to a more electropositive element or group
Some hydrides, e.g. boron hydrides, do not conform to classical electron counting rules and the bonding is described in terms of multi-centered bonds
Hydride
covalent bond classification method. In the usual electron counting method, they are two-electron ligands. With respect to HSAB theory, they are classified
Transition metal complexes of pyridine-N-oxides and amine oxides
Transition_metal_complexes_of_pyridine-N-oxides_and_amine_oxides
Topics referred to by the same term
Classification System D7 polytope, in 7-dimensional geometry d7, a d electron count DVCPRO (D-7), a professional digital video format 7D (disambiguation)
D7
Chemical compound composed of boron and hydrogen atoms only
to Wade's Rules, electron counting scheme has been developed to predict or rationalize multicluster boranes. Some function as electron donors owing to
Boron_hydride_clusters
Mathematical entity to describe the probability of each possible measurement on a system
region and, when squared, only predict the probability distribution of electron counts across the detector. The process of describing a quantum system with
Quantum_state
Type of reaction in organometallic chemistry
elimination, the oxidation state of the metal decreases by two, while the d-electron count of the metal increases by two. This pathway is common for d8 metals
Reductive_elimination
Chemical compound
attached via oxygen (tBu3SiO−)) ligands. The tantalum center has a d-electron count of 2 and an oxidation state of III. The complex is trigonal planar whose
Tris(silox)tantalum
the Covalent bond classification method. In the usual electron counting method, it is a one-electron ligand. The NCO unit is linear or nearly so in cyanate
Transition metal cyanate complexes
Transition_metal_cyanate_complexes
Chemical element with atomic number 28 (Ni)
square-planar geometry. Nickelocene has an electron count of 20. Many chemical reactions of nickelocene tend to yield 18-electron products. Many Ni(III) compounds
Nickel
Topics referred to by the same term
ICD-10 code D06, an abnormal growth of cells on the cervix d6, a d electron count of a transition metal complex D6, in mathematics, the dihedral group
D6
Covalent bond classification method. In the usual electron counting method, they are three-electron ligands. With respect to HSAB theory, dithiophosphates
Transition metal dithiophosphate complex
Transition_metal_dithiophosphate_complex
Coordination complexes of transition metals and metal ions with carbon monoxide ligands
+ CO Metal–metal bonds are cleaved by halogens. Depending on the electron-counting scheme used, this can be regarded as an oxidation of the metal atoms:
Metal_carbonyl
Experimental technique to determine the distribution of electrons in solids
photoelectric effect, in which an incoming photon of sufficient energy ejects an electron from the surface of a material. By directly measuring the kinetic energy
Angle-resolved photoemission spectroscopy
Angle-resolved_photoemission_spectroscopy
First modern model of the atom
first proposed by J. J. Thomson in 1904 following his discovery of the electron in 1897, and was rendered obsolete by Ernest Rutherford's discovery of
Plum_pudding_model
Potential configurations of electrons
refers to the potential spin configurations of the central metal's d electrons. For several oxidation states, metals can adopt high-spin and low-spin
Spin_states_(d_electrons)
Rule in organic chemistry
according to Baird's rule, aromatic when it has 4n π-electrons and antiaromatic when the π-electron count is 4n + 2, where n is any positive integer. This
Baird's_rule
Chemical element with atomic number 14 (Si)
doped with small concentrations of elements with differing valence electron count (typically boron and phosphorus), which greatly increase its conductivity
Silicon
Class of chemical compounds
oxygen atoms, the respective notation being κ1- and κ2-. In terms of electron counting, κ1-carboxylates are "X"-type ligands, i.e., a pseudohalide-like.
Transition metal carboxylate complex
Transition_metal_carboxylate_complex
Covalent bond classification method. In the usual electron counting method, they are two-electron ligands. With respect to HSAB theory, the ligand is
Transition metal arsine complexes
Transition_metal_arsine_complexes
Class of chemical compounds
the covalent bond classification method. In the usual electron counting method, it is a two-electron ligand. With respect to HSAB theory, it is intermediate
Transition metal pyridine complexes
Transition_metal_pyridine_complexes
British chemist
Wade's Rules, also known as polyhedral skeletal electron pair theory, are a set of electron counting rules to predict the shapes of borane clusters. 1982:
Kenneth_Wade
Class of chemical compounds
CH3): Co(O2C3Me2H)3 + 3 NO2+ → Co(O2C3Me2NO2)3 + 3 H+ In terms of electron counting, neutral bidentate O,O-bonded acac ligand is an "L-X ligand", i.e
Metal_acetylacetonates
Hypothetical charge assigned to an atom in a molecule based on its valence shell
hypothetical charge assigned to an atom in a molecule, assuming that electrons in all chemical bonds are shared equally between atoms, regardless of
Formal_charge
(1928). "Elektronenzählrohr zur Messung schwächster Aktivitäten [Electron counting tube for measurement of weakest radioactivities]". Die Naturwissenschaften
List of German inventions and discoveries
List_of_German_inventions_and_discoveries
Chemical element with atomic number 17 (Cl)
element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity on the revised Pauling
Chlorine
Tabular arrangement of the chemical elements
both valence electron count and valence orbital type. As chemical reactions involve the valence electrons, elements with similar outer electron configurations
Periodic_table
Type of compound having a metal center
involves the variation of the M-C bonds, which elongate as the valence electron count deviates from 18. In metallocenes of the type (C5R5)2M, the cyclopentadienyl
Metallocene
Organometallic chemical compound
approaches to electron counting, based on either radical species or ionic species. Using the radical approach, a rhodium centre has 9 electrons irrespective
Rhodocene
Method of microscopic imaging
aberrations. Ptychography has been demonstrated with visible light, X-rays, electrons and extreme-ultraviolet radiation, enabling quantitative phase contrast
Ptychography
possible bond angles. The bond valence model is an extension of the electron counting rules and its strength lies in its simplicity and robustness. Unlike
Bond_valence_method
Chemical compound
reinforce fundamental topics in organometallic chemistry like d-electron count, the 18-electron rule, oxidation state, valency, and the isolobal analogy. Many
Dimanganese_decacarbonyl
Logarithmic unit expressing the ratio of physical quantities
suggest. Sometimes the 20 log ratio definition is applied to electron counts or photon counts directly, which are proportional to sensor signal amplitude
Decibel
Radiation resulting from particle-antiparticle collisions
annihilate. Most commonly, this refers to 511-keV photons produced by an electron interacting with a positron. These photons are frequently referred to as
Annihilation_radiation
Compound with a metal center bound to ligands
the number of donor atoms). Usually one can count the ligands attached, but sometimes even the counting can become ambiguous. Coordination numbers are
Coordination_complex
Chemical interaction of certain ligands with metals of bond order >1
oxidation states with low d electron counts. The high oxidation state stabilizes the highly reduced ligands. The low d electron count allow for many bonds between
Metal–ligand_multiple_bond
Smallest unit of a chemical element
generally neutrons, surrounded by an electromagnetically bound swarm of electrons. The chemical elements are distinguished from each other by the number
Atom
Description of a molecule's true bond structure as a combination of structures
structures. Electron delocalization stabilizes a molecule because the electrons are more evenly spread out over the molecule, decreasing electron-electron repulsion
Resonance_(chemistry)
Mineral supergroup
have a distinct preference for the octahedral site depending on the d-electron count. If the A2+ ions have a strong preference for the octahedral site, they
Spinel_group
Material of moderate electrical conductivity
semiconductors. The behavior of charge carriers, which include electrons, ions, and electron holes, at these junctions is the basis of diodes, transistors
Semiconductor
Mixing (superposition) of atomic orbitals
etc., than the component atomic orbitals) suitable for the pairing of electrons to form chemical bonds in valence bond theory. For example, in a carbon
Orbital_hybridisation
Type of electron microscopy
Photoemission electron microscopy (PEEM, also called photoelectron microscopy, PEM) is a type of electron microscopy that utilizes local variations in electron emission
Photoemission electron microscopy
Photoemission_electron_microscopy
Chemical element with atomic number 33 (As)
gallium arsenide, indium arsenide, and aluminium arsenide. The valence electron count of GaAs is the same as a pair of Si atoms, but the band structure is
Arsenic
Covalent bond classification method. In the usual electron counting method, they are three-electron ligands. With respect to HSAB theory, they are classified
Transition metal dithiocarbamate complexes
Transition_metal_dithiocarbamate_complexes
Chemical compound
Electron counting of this iron(II) complex indicates that (C5H5)Fe(CO)2I is an 18-electron complex: using the neutral method there are 8 electrons from
Cyclopentadienyliron dicarbonyl iodide
Cyclopentadienyliron_dicarbonyl_iodide
purpose of electron-counting, C-bonded acyl ligands count as 1-electron ligands, akin to pseudohalides. η2-Acyl ligands count as 3-electron "L-X" ligands
Transition metal acyl complexes
Transition_metal_acyl_complexes
Scientific instrument for observing small objects
by a photon-counting camera. The two major types of electron microscopes are transmission electron microscopes (TEMs) and scanning electron microscopes
Microscope
Instrument for measuring ionizing radiation
spectroscopy Geiger counter Liquid scintillation counting Lucas cell Pandemonium effect Photon counting Scintigraphy Total absorption spectroscopy Wikimedia
Scintillation_counter
Concept in quantum mechanics
mechanics that fundamental entities of the universe, like photons and electrons, exhibit particle or wave properties according to the experimental circumstances
Wave–particle_duality
Chemical compound
open‐shell 67‐electron superatom. It is notable for its large electron count compared to other heterometallic superatoms and its unprecedented electron structure
Heterometallic copper-aluminum superatom
Heterometallic_copper-aluminum_superatom
Method of analyzing transmission electron microscopy imagery
computerized image processing techniques used to analyze images from transmission electron microscopy (TEM). These methods were developed to improve and extend the
Single_particle_analysis
ELECTRON COUNTING
ELECTRON COUNTING
Boy/Male
Assamese, Bengali, Indian, Tamil
To Choose; Selection
Boy/Male
Arabic, Muslim
Choice; Preference; Selection
Surname or Lastname
English
English : from Middle English biscop, Old English bisc(e)op ‘bishop’, which comes via Latin from Greek episkopos ‘overseer’. The Greek word was adopted early in the Christian era as a title for an overseer of a local community of Christians, and has yielded cognates in every European language: French évêque, Italian vescovo, Spanish obispo, Russian yepiskop, German Bischof, etc. The English surname has probably absorbed at least some of these continental European cognates. The word came to be applied as a surname for a variety of reasons, among them service in the household of a bishop, supposed resemblance in bearing or appearance to a bishop, and selection as the ‘boy bishop’ on St. Nicholas’s Day.
Boy/Male
Muslim
Choice, Preference, Selection
Boy/Male
English American
A sometimes used as an independent name. Also, in England, 'Ernie' refers to the Electronic...
Surname or Lastname
French
French : from a personal name of Gaulish origin, represented in Latin records in the form Caraunus. This name was borne by a 5th-century Breton saint who lived at Chartres and was murdered by robbers; his legend led to its widespread use as a personal name during the Middle Ages.English (of Norman origin) and French : habitational name for someone from Cairon in Calvados, France.English and French : metonymic occupational name for a carter, or possibly a cartwright, from a Norman and Picard form of Old French c(h)arron ‘cart’.There was a Caron or LeCaron, a missionary priest, in Quebec in 1615. The marriage of a Caron, of unknown origin, is recorded in Quebec in 1637.
Boy/Male
Biblical
Election; he that is chosen.
Girl/Female
American, Hindu, Indian
Selection
Biblical
election; he that is chosen;he will choose;chooser; God does choose;
Boy/Male
Hindu, Indian
Counting
Boy/Male
Muslim/Islamic
Selection choice
Female
Italian
Italian form of Latin Electra, ELETTRA means "bright, shining."
Biblical
fifty count or the counting of fifty days
Girl/Female
Greek
Sparkling. The fiery sun. Mythological daughter of Agamemnon. In literature she was a central...
Girl/Female
Australian, Danish, Greek
Bright; Shining
Boy/Male
Arabic, Muslim, Sindhi
Selection; Choice
Boy/Male
Arabic
Electric Light
Boy/Male
Arabic, Hindu, Indian, Muslim
Election; Last Dream
Boy/Male
Muslim
Selection, Choice
Female
English
English name derived from the vocabulary word, from Greek kyanos, CYAN means "dark blue" and "lapis lazuli." The color cyan is also sometimes called blue-green, electric blue, and turquoise.Â
ELECTRON COUNTING
ELECTRON COUNTING
Girl/Female
Bengali, Indian
A Very Beautiful Girl
Girl/Female
Tamil
Sivasankari | ஸிவாஸஂகரீ
Goddess Parvati
Girl/Female
Muslim/Islamic
Very Noble
Girl/Female
Australian, German, Latin
Gray-haired; Patience of Griselda; Gray
Girl/Female
Arabic, French, Muslim
Immortal; Abiding; Forever; Eternal
Girl/Female
Bengali, Hindu, Indian, Kannada, Malayalam, Marathi, Sindhi, Telugu
Full of Happiness
Girl/Female
French, German, Latin
Wanderer
Boy/Male
Indian, Sanskrit
One who Sounds Like a Bell; Lord Shiva
Girl/Female
Arabic, Muslim
Delight; Joy
Biblical
the destroyer; see Apollyon a destroyer,the angel of the bottomless pit (Revelation :)
ELECTRON COUNTING
ELECTRON COUNTING
ELECTRON COUNTING
ELECTRON COUNTING
ELECTRON COUNTING
a.
Of or pertaining to electro-kinetics.
n.
A lesson or selection, esp. of Scripture, read in divine service.
a.
Belonging to the electro-chronograph, or recorded by the aid of it.
a.
Alt. of Electro-dynamical
n.
Alt. of Electro-puncturing
a.
Pertaining to an election or to electors.
a.
Producing electro-motion; producing, or tending to produce, electricity or an electric current; causing electrical action or effects.
n.
One versed in electro-biology.
a.
Pertaining to electro-ballistics.
n.
The art or science of constructing or using the electric telegraph; the transmission of messages by means of the electric telegraph.
n.
An election held by itself, not at the time of a general election.
a.
Of or pertaining to electro-chemistry.
a.
Pert. to, or caused by, electro-capillarity.
n.
An instrument for measuring the strength of electro-dynamic currents.
n.
Amber; also, the alloy of gold and silver, called electrum.
a.
Made of electrum, an alloy used by the ancients.
a.
The act of choosing; choice; selection.
a.
Alt. of Electro-metrical
a.
Pertaining to the movements or force of electric or galvanic currents; dependent on electric force.