Understanding Bond Energies: X-Y Bond Energy Contribution

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SUMMARY

The discussion centers on the bond energy contribution between two atoms, specifically when one atom (X) is small and the other (Y) is large. The consensus is that the bond energy (E A-B) will have a large ionic contribution due to the significant difference in electronegativity between the two atoms. This difference is influenced by the size of the atoms, as smaller atoms typically have higher electronegativity, leading to a stronger ionic character in the bond. Understanding this relationship is crucial for grasping concepts in molecular chemistry.

PREREQUISITES
  • Basic understanding of ionic and covalent bonds
  • Knowledge of electronegativity and its significance in chemical bonding
  • Familiarity with atomic size and its effects on bond characteristics
  • Concept of bond energy and its measurement in chemistry
NEXT STEPS
  • Research the concept of electronegativity and its calculation methods
  • Study the differences between ionic and covalent bonds in detail
  • Explore how atomic size influences chemical reactivity and bonding
  • Learn about bond energy calculations and their applications in molecular chemistry
USEFUL FOR

Chemistry students, educators, and professionals interested in molecular bonding, particularly those focusing on the implications of atomic size and electronegativity on bond energy.

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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