Noun
electronegativity- The tendency, or a measure of the ability, of an atom or molecule to attract electrons and thus form bonds.
Read full definition at wiktionary.org
...The most commonly used method of calculation is that originally proposed by Pauling. This gives a dimensionless quantity, commonly referred to as the Pauling scale, on a relative scale running from 0.7 to 4.0 (hydrogen = 2.2). When other methods of calculation are used, it is conventional (although not obligatory) to quote the results on a scale that covers the same range of numerical values: this is known as an electronegativity in Pauling units. Read full entry
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- 1.Electronegativity - Wikipedia, the free encyclopedia
- Electronegativity, symbol χ, is a chemical property that describes the ability ... The higher the associated electronegativity number, the more an element or ...
- http://en.wikipedia.org/wiki/E
lectronegativity
- 2.electronegativity
- Explains what electronegativity is and how and why it varies around the Periodic Table ... you are interested in electronegativity in an organic chemistry ...
- http://www.chemguide.co.uk/ato
ms/bonding/electroneg.html
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Electronegativity?
So, which of you kind folks
wants to explain to me why
electronegativity decreases as
you move down the table
(groups) and increases as you
move across the table
(periods)?
Thanks.
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Electronegativity is a measure of the tendency of an atom to attract electrons to itself when chemically bonded to another atom. As you move from left to the right across the PT , the electronegativity tends to increase. Elements on the right side of the PT tend to gain electrons in order to achieve the stable noble gas electron configuration so they are more likely to attract electrons. The metals at the left are more likely to lose electrons to achieve this stable noble gas electron configuration so are then less likely to attract electrons. You won't find electronegativity values for noble gases because they don't form bonds. Their electron configuration is stable with an octet of valence electrons. As you move down the periodic table the valence electrons are moving greater distance from the nucleus, shielding effect tends to increase, atomic radius is increasing and so the electronegativity values for the elements tend to decrease. |
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What is the difference between What is the difference between
electronegativity and electron
affinity?
My book says:
electron affinity: the ability
of an atom to attact
additional electrons
and electronegativity: the
ability of an atom to attract
a bonding pair of electrons to
itself when bonded to another
atom.
and i can see that obviously
those are two different
statements and that's the
difference between them, but i
don't understand the
differerence.
thanks
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According to those definitions the electron affinity is to attract any electron. The electronegativity is to attract the electrons in a covalent bond between that atom and another. The electronegativity tells which of the atoms involved in the bond will have a larger attraction for the pair of shared electrons. |
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What is the significance of I'm having trouble
understanding the part that
electronegativity plays with
respect to the polarity of the
peptide bond and the
solubility of biomolecules in
water. I am studying for an
exam in a few days, but am
confused on a few things.
Thanks in advance!
This is for a university
course.
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You may have heard the term "Like dissolves like." Water molecules are polar molecules, in which the electrons are "pulled" closer towards the oxygen molecules creating a negative dipole. Water molecules can attach to other polar molecules. This hydrogen bond attraction between the water molecule and the biomolecule is greater than the interactions between the biomolecules themselves, which is preferably more favored. |
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