How to say whether an element is more electronegative?

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Discussion Overview

The discussion centers around the comparison of electronegativity between phosphorus (P) and nitrogen (N), exploring the criteria that determine electronegativity and the factors influencing it, such as atomic size and electron shell configuration. Participants are seeking clarity on how to assess electronegativity in the context of their upcoming exams.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Exploratory

Main Points Raised

  • One participant questions whether valency should be considered when comparing electronegativity between N and P, suggesting that P might be more electronegative due to its higher valency.
  • Another participant states that both N and P have 5 electrons in their outer shell, implying that atomic size is the primary factor in determining electronegativity.
  • A later reply adds that N has 2 electron shells while P has 3, noting that electronegativity decreases down a group, which supports the idea that N is more electronegative than P.
  • One participant mentions the correlation between effective size and the number of shells, suggesting a relationship between these factors and electronegativity.
  • Another participant expresses skepticism about the concept of electronegativity, describing it as poorly defined and sometimes contradictory, which complicates its application.
  • One participant points to the trend in the periodic table, indicating that looking further down the group (P, As, Sb, Bi) may provide additional context for understanding electronegativity.
  • Another participant notes that nitrogen's smaller size leads to higher charge density and less shielding of the nucleus, contributing to its higher electronegativity.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the factors that should be prioritized when determining electronegativity, with multiple competing views presented regarding the roles of atomic size, electron shells, and valency.

Contextual Notes

Some participants highlight the complexity and ambiguity of the electronegativity concept, noting that various definitions exist, which may lead to conflicting predictions.

Anithadhruvbud
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Amoung phosphorous and nitrogen which one is more electronegative? My book says it is nitrogen because it is small in size but shouldn't it be phosphorous since it has higher valency than nitrogen?
When we compare two elements based on their electronegativity, should we not look at it's valencies? If not what is the criteria to be used?
Finals coming up,answer soon,please!
 
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Both N and P have 5 electrons in the outer shell, so the deciding factor is size.
 
BvU said:
Both N and P have 5 electrons in the outer shell, so the deciding factor is size.
I just found out another factor too.N has 2 shells while P has 3 shells.Now it is known that as we go down a group electronegativity decreases.Hence N should be more electronegative since it is place before phosphorous in 5th group depending on their shells.
 
Yes, there is some correlation between effective size and number of shells ...
 
Electronegativity - while sometimes quite useful - is a rather handwavy concept, poorly defined (many definitions, sometimes giving contradicting predictions). As with every poorly defined concept it becomes hard to apply/explain/use when you get into details.

- Doc, it hurts when I do that.
- Don't.

That how I approach this kind of problems :wink:
 
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Borek is right: look further down in these tables -- P, As, Sb, Bi
 
Nitrogen is smaller, and so has higher charge density. Also the nucleus is less shielded so electrons will feel a greater pull, which explains it's higher electronegativity.
 

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