O QUE SIGNIFICA COVALENCY EM INGLÊS
Ligação covalente
Uma ligação covalente é uma ligação química que envolve o compartilhamento de pares de elétrons entre os átomos. O equilíbrio estável das forças atrativas e repulsivas entre átomos quando eles compartilham elétrons é conhecido como ligação covalente. Para muitas moléculas, o compartilhamento de elétrons permite que cada átomo atinja o equivalente a um invólucro exterior completo, correspondente a uma configuração eletrônica estável. A ligação covalente inclui muitos tipos de interações, incluindo a ligação σ, a ligação π, a ligação metal-a-metal, as interações agostáticas e as ligações de dois elétrons de três centros. O termo ligação covalente data de 1939. O prefixo co significa conjuntamente, associado em ação, em parceria em menor grau, etc .; portanto, um "vínculo covalente", em essência, significa que os átomos compartilham "valência", como é discutido na teoria dos vínculos de valência. Na molécula H 2, os átomos de hidrogênio compartilham os dois elétrons via ligação covalente. A covalência é maior entre átomos de eletronegatividades semelhantes. Assim, a ligação covalente não exige necessariamente que os dois átomos sejam dos mesmos elementos, apenas que sejam de eletronegatividade comparável.
definição de covalency no dicionário inglês
A definição de covalência no dicionário é a formação e a natureza das ligações covalentes. Outra definição de covalência é o número de ligações covalentes que um átomo particular pode fazer com outros átomos na formação de uma molécula.
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10 LIVROS EM INGLÊS RELACIONADOS COM «COVALENCY»
Descubra o uso de
covalency na seguinte seleção bibliográfica. Livros relacionados com
covalency e pequenos extratos deles para contextualizar o seu uso na literatura.
1
Transition Metal and Rare Earth Compounds: Excited States, ...
Covalency and crystal field effects in lanthanide systems are normally described
by the Slater parameters Fk (k = 2, 4, 6) and the crystal field parameters Bkq (k, q
depend on the symmetry of the lanthanide bonding environment). In contrast to ...
Hartmut Yersin, K.L. Bray,
2001
2
Core Level Spectroscopy of Solids
The splitting of the XPS spectrum is caused by an increase of the covalency
mixing in going from the ground state to the XPS final state. In order to see this,
we define the “covalency parameter” γ0 (in the ground state) and γ (in the final
state) ...
Frank de Groot, Akio Kotani,
2008
3
Mass transport in oxides: proceedings of a symposium held at ...
Recent developments in our understanding of neutron diffraction by
antiferromagnetic solids have made it possible to obtain in a relatively direct way
a quantitative measure of covalency — including the determination of electron
derealization ...
J. B. Wachtman, Alan D. Franklin, United States. Advanced Research Projects Agency,
1968
4
Modern Inorganic Chemistry
Consequently, the covalency of an element in a covalent compound is equal to
the number of covalent bonds formed by one atom of it with the neighbouring
atom. Thus the covalency of Cl in OIi molecule =1, of H in H«, H^O and HC1 ...
R.D.Madan & Satya Prakash, R. D. Madan,
1987
5
Reactivity of Iron- and Nickel-dithiolate Model Complexes of ...
In order to directly compare the bonding of LFeCN and LFeCl, additional
interactions need to be considered using NBO/NLMO as described by Richards/^
This approach involves the summation of covalency contributions to metal-ligand
...
6
Advanced Inorganic Chemistry Vol-1
3.8 VARIABLE COVALENCY The covalency of an element is ordinarily equal to
the number of unpaired s cr p electrons present in the ground state of the atom.
For example, fluorine with configuration Is2 2s2 3px2 p/ p,1 has only one
unpaired ...
7
Basic Concepts Of Inorganic Chemistry
Table 2.5 The basic reason for covalency in ionic bond is polarization effect.
Cations, in general, are small and their effective nuclear charge (Z*) is high.
Anions are large in size and their Z* is relatively small, (Z* a+ = 6.85 and Z*(F") =
4.85).
8
Medical Colleges: Entrances Examinations - Chemistry
Variable covalency is due to the presence of vacant d-orbitals in the valence
shell. Generally, covalency is equal to the number of unpaired electrons in the s
or p-orbitals. Thus the covalency of the sulphur atom is explained as follows:
Sulphur ...
C. Sadasivam, Sura College of Competition,
2004
9
The Effective Crystal Field Potential
of type .9 and p, i.e. for 'r = s,p0,pi1, the covalency contributions both the contact
and ordinary ones refer to do and a±i states only. Since these are dominating
contributions to the crystal field potential this explains also a dominating role of e,
...
10
Inorganic Chemistry for Undergraduates
It is impossible to consider any of the four factors independently while ignoring
others when covalency is studied. However, Fajans' rules are helpful
approximations for explaining the difference in covalency among certain sets of
compounds.
10 NOTÍCIAS NAS QUAIS SE INCLUI O TERMO «COVALENCY»
Conheça de que se fala nos meios de comunicação nacionais e internacionais e como se utiliza o termo
covalency no contexto das seguintes notícias.
Going Back to Californium: A Changing View of Covalency
The heaviest element that exists in usable quantities on Earth, californium is surprisingly able to covalently bond with borate, dramatically ... «Newswise, jun 15»
Principia Biopharma Presents Full Phase 1 Clinical Trial Results for …
It was designed using Principia's proprietary Tailored Covalency™ technology to optimize its safety and efficacy profile, resulting in a prolonged ... «Business Wire, jun 15»
Principia Biopharma and UCSF Scientists Announce Publication of …
The paper describes a novel approach, using Principia's Tailored Covalency™ technology, to discovering and developing reversible covalent ... «Business Wire, mai 15»
Actuator program to assist entrepreneurs' early exits
To aid young, growing companies in their M&A goals, the Innosphere partnered with Boulder-based Covalency for the Actuator program. «The Coloradoan, mar 15»
Principia Biopharma Appoints Roy Hardiman as Chief Business …
The Company has utilized its proprietary Tailored Covalency™ technology to develop a portfolio of drug candidates that exhibit antibody-like ... «Business Wire, jan 15»
Principia Biopharma Successfully Completes Phase 1 Clinical Trial …
PRN1008 is an oral, reversible covalent BTK inhibitor designed with Principia's proprietary Tailored Covalency™ technology. This approach ... «Business Wire, jan 15»
Assessing covalency in the hydrogen bond zoo
Richard Dronskowski and colleagues at RWTH Aachen University collected evidence from hydrogen-bonded molecular crystals to elucidate ... «Chemistry World, out 14»
Californium compound springs bonding surprise
'What we currently understand is that covalency tends to drop away as you go across the series to the heavier elements. Californium is one of ... «Chemistry World, mar 14»
Exotic interactions uncovered in actinide systems
However, in many cases it is proposed that these small changes in f-element covalency are responsible for profound changes in chemical ... «Chemistry World, nov 13»
Ben Cravatt At The Challenges In Chemical Biology Conference
Pfizer, he says, backed off when this mechanism was uncovered - they weren't ready at the time for covalency, but he says that they've ... «Corante, jul 13»