Are All Charged Molecules Polar and Can Polar Molecules Be Uncharged?

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Discussion Overview

The discussion revolves around the relationship between charged molecules and their polarity, specifically questioning whether all charged molecules are polar and if polar molecules can exist in an uncharged state. The scope includes conceptual understanding and theoretical considerations in molecular chemistry.

Discussion Character

  • Conceptual clarification, Debate/contested, Exploratory

Main Points Raised

  • One participant suggests that all charged molecules must be polar due to an unequal distribution of charge, while polar molecules can be either charged or uncharged based on electronegativity differences.
  • Another participant introduces the idea of symmetry, asserting that H2+ is non-polar.
  • A subsequent reply acknowledges the previous point and proposes a model involving resonance forms for H2(+), where the electron distribution fluctuates between the two hydrogen atoms.
  • A later contribution emphasizes a quantum mechanical perspective, suggesting that the electron in H2(+) occupies an orbital that symmetrically spans both hydrogen nuclei.

Areas of Agreement / Disagreement

Participants express differing views on the polarity of charged molecules and the implications of molecular symmetry, indicating that multiple competing perspectives remain unresolved.

Contextual Notes

Participants reference concepts such as resonance and orbital symmetry, which may depend on specific definitions and assumptions about molecular behavior and charge distribution.

christian0710
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Hi,
Is it correctly understood that all charged molecules are polar (if they have a charge at some point, they must also have a unequal distribution of positivity and negativity)

but polar molecules can be charged or uncharged ( they have Δelectronegativity)
 
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You have to take into account symmetry. I'm pretty sure that H2+ is non-polar!
 
Ahh yes that makes sense! thank you :)
So in the case of H2(+) I could imagine there are (if one can say) two resonance form, where 50% of the time the electron is most at Hydrogen A and the other 50% most at hydrogen B.
 
In a simple classical picture, yes. Quantum mechanically, you just have to see the electron as being in an orbital that stretches symetrically over the two hydrogen nuclei.
 

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