Equal electronegativities and covalent bond formation

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Discussion Overview

The discussion revolves around the question of whether two atoms with equal electronegativities will form polar covalent bonds. It explores the implications of electronegativity in bond formation, particularly in the context of covalent versus ionic bonding, and includes a homework-related query regarding a specific statement.

Discussion Character

  • Homework-related
  • Debate/contested

Main Points Raised

  • One participant asserts that the statement about equal electronegativities leading to polar covalent bonds is true, but their answer was marked wrong, leading to confusion about the nature of the question.
  • Another participant points out that the inclusion of the term "polar" in the statement is likely the reason for the incorrect answer, suggesting that equal electronegativities would not result in polar covalent bonds.
  • A further contribution notes that while the statement may hold true for interactions between two atoms, there are exceptions when more than two atoms are involved, citing a specific example of boron clusters.
  • One participant questions whether the example provided involves atoms with differing electronegativities, implying that the electronegativities of the pseudoatoms in the example may not be equal.

Areas of Agreement / Disagreement

Participants express disagreement regarding the interpretation of the statement about equal electronegativities and polar covalent bonds. There is no consensus on whether the original statement is true or false, and the discussion remains unresolved regarding the implications of multiple atoms in bonding scenarios.

Contextual Notes

The discussion highlights the complexity of electronegativity and bonding, particularly in cases involving more than two atoms. There are unresolved assumptions about the nature of the bonds formed in specific examples, and the definitions of terms like "polar" and "covalent" may vary among participants.

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Homework Statement


True or false: When two atoms are equally electronegative, they will interact to form polar covalent bonds.

Homework Equations


Atoms with similar or equal electronegativities share electrons between them and are connected by covalent bonds.
Atoms with large differences in electronegativity transfer electrons to form ions. The ions then are attracted to each other, = an ionic bond.

The Attempt at a Solution


I answered true and it was marked wrong. Not understanding why though. The only thing I can think of is maybe the question is asking if two atoms of equal electronegativity will necessarily form covalent bond. Other than that, I thought it should be true. Not sure what I did wrong. thanks
 
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this is stupid. I just noticed it says "polar" covalent. That must be the problem!
 
sp3sp2sp said:
this is stupid. I just noticed it says "polar" covalent. That must be the problem!
Yes, it is the qualifier "polar" that makes the statement false.
 
Just wanted to note that, while this statement is probably true for the interaction of only two atoms, there are counterexamples when more than two are involved.
For example, there exists a partially ionic modification of boron (Gamma-boron) consisting of B2+ and B12- clusters arranged in a NaCl type lattice.
 
Isn't that simply because the electronegativities of the pseudoatoms B2+ and B12- are not the same though, at some level?
 

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