Ionic and Covalent Character

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Tiffany Wu 1K
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Ionic and Covalent Character

Postby Tiffany Wu 1K » Thu Oct 27, 2016 2:19 am

What is the difference between ionic and covalent character and how do we determine strength of each of them? Do we use the periodic table?

Vivian Wang 3J
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Re: Ionic and Covalent Character

Postby Vivian Wang 3J » Thu Oct 27, 2016 2:34 am

Ionic and covalent character describe the nature of the bond between atoms.
For example, a molecule with a higher ionic character than covalent character means that the atoms have more of a give-and-take relationship for the electrons that bond them.
If the bond were described to have higher covalent character, the atoms are sharing the electrons.

Covalent bonds do have some ionic character, though it is very low. As seen in this chart, covalently bonded molecules (HCl, HBr, and HI) have lower ionic character than ionically bonded molecules.
Image
Likewise, ionic bonds can have covalent character, though it will be low.

The ionic/covalent character can be determined using the periodic table. The greater the difference in electronegativity between the atoms, the greater the ionic character of the bond.
Image

Mirna_Velasco_1L
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Re: Ionic and Covalent Character

Postby Mirna_Velasco_1L » Thu Oct 27, 2016 11:05 am

Vivian Wang, You said that the ionic/covalent character can be determined using the periodic table. And that the greater the difference in electronegativity between the atoms, the greater the ionic character of the bond, so does this means that if there is not much difference in electronegativity between the atoms, than it should have covalent character instead. Or how do we decide if the atoms have covalent character. I am still confused on how to distinguish between ionic and covalent character? I will appreciate if someone explains this to me?

Vivian Wang 3J
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Re: Ionic and Covalent Character

Postby Vivian Wang 3J » Fri Oct 28, 2016 11:16 am

"Ionic and covalent character represent points along a continuum."

Based on this statement, we can assume that as ionic character of a bond increases, covalent character of the same bond decreases.
And, as covalent character of a bond increases, ionic character of that bond decreases.

Mizuno_Mikaela_1D
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Re: Ionic and Covalent Character

Postby Mizuno_Mikaela_1D » Fri Oct 28, 2016 3:18 pm

How do we determine covalent character of an ionic bond? I know in the course reader it says the more polarizable the anion, the more covalent character the ionic bond has due to a larger distortion, however I still do not quite understand what that means or how that makes the bond have more covalent character.

NinaSheridan
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Re: Ionic and Covalent Character

Postby NinaSheridan » Fri Oct 28, 2016 3:45 pm

So based on this logic, any bond with small ionic character (such as elements of the same group, or the same element bonding with another atom of the same element) would have the highest covalent character, and elements far apart from one another on the periodic table would have low covalent character.


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