Understanding Bond Energies: X-Y Bond Energy Contribution

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Discussion Overview

The discussion revolves around the concept of bond energy in the context of two bonded atoms, specifically focusing on how the size and electronegativity of the atoms influence the bond energy contribution. The inquiry is rooted in a question from an MIT course, exploring the nature of the bond between a small atom X and a large atom Y.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant inquires about the bond energy contribution when considering a small atom X and a large atom Y.
  • Another participant claims the answer is "ionic," suggesting that the bond has a high ionic character due to the difference in electronegativity between the two atoms.
  • A subsequent participant questions the reasoning behind the expectation that electronegativity would depend on the size of the atoms involved.
  • A correction is made to clarify that the original question refers to the electronegativity (e) of the atoms, indicating that a small eX and large eY will influence the bond energy contribution.

Areas of Agreement / Disagreement

There is no consensus on the reasoning behind the ionic character of the bond, as participants express differing views on the relationship between atom size and electronegativity.

Contextual Notes

The discussion highlights assumptions regarding the definitions of ionic character and electronegativity, as well as the implications of atom size on these properties. Some statements remain uncorrected or unresolved, particularly regarding the dependence of electronegativity on atomic size.

guiromero
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Hello.

Could someone please help me with this question about bond energy from an MIT course:

"For two bonded atoms X and Y, a small X and large Y will result in a bond energy (E A-B) with a large __________ contribution."

Thanks a lot if someone can help.
 
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I've already gotten the answer, it's "ionic".
 
Why is it ionic?
 
I got this answer from another forum and the person said that these types of bonds have a high ionic character, which is the percentage of difference between the electronegativity of two covalently bonded atoms.
 
Why would you expect the electronegativity of the respective atoms to depend upon the size of those atoms?
 
Sorry, I forgot to correct the statement. The correct is like that:

"For two bonded atoms X and Y, a small eX and large eY will result in a bond energy (E A-B) with a large __________ contribution."

Where e = electronegativity
 

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