If I have two elements A and B, is the compound AB the same as BA?

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Discussion Overview

The discussion centers on the naming conventions of chemical compounds and whether the order of elements in a compound, such as AB versus BA, affects their identity. It touches on theoretical aspects of chemistry and the implications of element order in different contexts.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants inquire about the criteria for naming compounds, using NaCl as an example.
  • Others propose that the positive ion typically precedes the negative ion in naming conventions, as seen in H2O versus HOH.
  • One participant notes that IUPAC rules govern the naming of compounds to ensure uniqueness and clarity, although these rules have evolved over time.
  • Another participant asserts that, in general, the order of elements in compounds does not matter, but highlights exceptions in polymers and anisotropic materials where order is significant.

Areas of Agreement / Disagreement

Participants express differing views on whether the order of elements in a compound affects its identity, with some asserting that it does not matter while others indicate that there are exceptions.

Contextual Notes

Limitations include the dependence on specific definitions of compounds and the context of their application, as well as the historical evolution of naming conventions.

Raziel2701
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Is there a specific reason for how compounds are named? Like NaCl for instance, what's the criteria to have NaCl rather than ClNa?
 
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There is a tendency to put the positive ion (or the element that acts as a donor of electrons) first so Na trumps Cl for first place - also why water is H2O and not, say, HOH. As you advance through chemistry you'll find there are lots of equivalent ways of writing out chemical names.
 
The only specific reason is that IUPAC defined naming rules so that when we talk about compounds we can name them in a way that is unique and unambiguous.

Not that all names assigned using IUPAC rules are unique and unambiguous, as the rules evolved with time, so some older publications can use different names than the current ones.
 
yes its the same thing lol. in general elements commute unlike operators in QM.

this works only for elements though. in polymers and in anisotropic materials order of the constituents matters.
 

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