Can the size of an atom change?

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Discussion Overview

The discussion centers around the question of whether the size of an atom can change, particularly in relation to concepts such as the Big Bang theory, gravitational forces, and the expansion of space. Participants explore theoretical implications and the nature of atomic size, touching on energy levels and forces at play within and outside atoms.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant questions if atoms can change size, suggesting that gravitational forces might compress them and inquiring about what regulates atomic size.
  • Another participant asserts that gravitational forces do not affect atomic size, proposing that atomic size is better understood in terms of energy levels of electrons.
  • A participant challenges the idea that the Big Bang theory implies changing atomic sizes, asking for clarification on this perspective.
  • Some participants discuss the relationship between the expansion of space and atomic size, with one suggesting that if space expands, atomic size might also be affected.
  • Another participant counters that the expansion of space does not impact gravitationally bound objects, including atoms, indicating that atomic size is governed by sub-atomic forces rather than cosmic expansion.
  • There is a discussion about the implications of gravity on the movement of galaxies and how this relates to the expansion of the universe, with some participants expressing confusion about the relationship between gravity and cosmic expansion.

Areas of Agreement / Disagreement

Participants express differing views on whether atomic size can change and the influence of gravitational forces and cosmic expansion on atoms. There is no consensus on these points, with multiple competing views remaining in the discussion.

Contextual Notes

Participants reference concepts such as energy levels, gravitational binding, and the metric expansion of space, but there are unresolved assumptions regarding how these concepts interact with atomic size.

dumdedo
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I've been searching and trying to find an answer to this. I'm not scholar or physics major. I'm asking for some guidance about this subject.

The big bang theory, leaves me with the impression that atoms can change size.

Is this true?

Can gravitational forces compress, can atoms become smaller?

What regulates an atom's size?

Can adjusting the space/time fabric change the size of an atom?


Thank you for your time. I'm really wondering how all the atoms can fit into the space of a green pea, as computer models suggest.
 
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As far as I know gravitation does not effect the size of atoms. Size for atoms is a difficult concept, but the simplest way to look at it is in terms of energy. Increasing the energy of an atom means the electrons are in more energetic levels which take up more room.
 
mathman said:
As far as I know gravitation does not effect the size of atoms. Size for atoms is a difficult concept, but the simplest way to look at it is in terms of energy. Increasing the energy of an atom means the electrons are in more energetic levels which take up more room.

Then forget gravity.

If there is space inside each atom, would it not also have to obey the expansion of space?

http://en.wikipedia.org/wiki/Metric_expansion_of_space

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Last edited:
Why would you say "The big bang theory leaves me with the impression that atoms can change size"?
 
Because if expansion of space is true, wouldn't the size atoms be related to the size of the Universe?
 
dumdedo said:
Because if expansion of space is true, wouldn't the size atoms be related to the size of the Universe?

Not at all. The expansion of space has no effect on gravitationally bound objects, such as clusters of galaxies, galaxies, solar systems, planets, you, atoms, etc.
 
So, space inside each atom is not effected by the inflation of space? Is that space inside an atom special?
 
Has nothing to do with space, it's the presence of a force that binds the objects together. For macro objects, it's gravity, for micro objects, it's sub-atomic forces.
 
Okay. I was just under the impression that if gravity caused macro objects to be pulled towards each other, the galaxies would not be getting farther apart, like they are doing.
 
  • #10
dumdedo said:
Okay. I was just under the impression that if gravity caused macro objects to be pulled towards each other, the galaxies would not be getting farther apart, like they are doing.

They are getting farther apart precisely in the empty gaps where gravity is too weak to pull them together.
 
  • #11

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