Nuclear Chemistry: Iron Nucleus & Energy Needs

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Discussion Overview

The discussion revolves around the binding energy of iron nuclei compared to other elements, particularly nickel, and the implications of these energies in relation to the mass-energy equivalence principle (E=mc²). The scope includes theoretical considerations of nuclear chemistry and binding energy concepts.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that the iron nucleus has the highest binding energy per nucleon, suggesting that while total binding energy increases with nuclear mass, the binding energy per nucleon reaches a maximum at iron.
  • Others question whether a heavier nucleus, such as nickel, could have less overall binding energy than iron, indicating a need for specific numerical data to clarify this point.
  • One participant raises a concern about the implications of binding energy on the mass-energy equivalence principle, questioning if a higher binding energy in iron could contradict E=mc².
  • Another participant counters this concern by explaining that binding energy relates to mass defect rather than total nuclear mass, asserting that the reasoning behind the initial concern is flawed.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between binding energy and nuclear mass, with some agreeing on the properties of iron while others remain uncertain about comparisons with nickel. The discussion about E=mc² also reveals a lack of consensus on the implications of binding energy.

Contextual Notes

Participants acknowledge the need for specific numerical values to support claims about binding energy comparisons, indicating that the discussion relies on assumptions about nuclear properties that may not be fully resolved.

Who May Find This Useful

This discussion may be of interest to those studying nuclear chemistry, physics students exploring binding energy concepts, or anyone curious about the implications of mass-energy equivalence in nuclear reactions.

+Minkie+
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Is it true an Iron nucleus requires the most amount of energy to hold it together?

I would have thought it would be the larger the nucleus the more energy is required to hold it toghether.
 
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+Minkie+ said:
Is it true an Iron nucleus requires the most amount of energy to hold it together?
Per nucleon, yes.

I would have thought it would be the larger the nucleus the more energy is required to hold it toghether.
The total binding energy increases with the nuclear mass, but the binding energy per nucleon hits a maximum at Fe.
 
So a heavier nucleus, not too much heavier, may have less overall binding energy than Fe?

Say Nickel compared to Iron?
 
+Minkie+ said:
So a heavier nucleus, not too much heavier, may have less overall binding energy than Fe?

Say Nickel compared to Iron?
It's possible, but I don't know the actual numbers.

PS: Fe-56 has the highest BE per nucleon among naturally occurring isotopes; I believe one of the artificial isotopes of Ni has a higher value.
 
Last edited:
What I'm getting at is if that were true wouldn't it prove E=MC^2 wrong?
As the Fe nucleus would have more energy but less mass than the nickel nucleus.
 
+Minkie+ said:
What I'm getting at is if that were true wouldn't it prove E=MC^2 wrong?
As the Fe nucleus would have more energy but less mass than the nickel nucleus.
No, it would not. The binding energy is not the same as the rest energy of the nucleus. The binding energy is related to the mass defect, not the total nuclear mass. The greater the mass defect, the greater the total binding energy.

If you think there's something that proves E=mc^2 wrong, then you've either got incorrect data, or you're applying an incorrect reasoning. In this case, it is the latter.
 
I see how my thinking was wrong, it was worth a try though.
:biggrin: Imagine proving Einstein wrong:biggrin:
 

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