How to Tell if an element is radioactive

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Discussion Overview

The discussion revolves around identifying whether an element is radioactive, particularly focusing on the neutron to proton (N/P) ratio and exceptions to general rules regarding this ratio. The scope includes conceptual understanding and clarification of radioactive elements and isotopes.

Discussion Character

  • Conceptual clarification, Debate/contested

Main Points Raised

  • One participant states that a neutron to proton ratio of 1.2 or higher indicates radioactivity, but notes an exception for ratios lower than 1.2, which remains unclear.
  • Another participant suggests consulting modern physics resources for more information on the topic.
  • A different participant mentions that there are synthetic isotopes with N/P ratios less than 1.2 that are beta emitters, but does not know of naturally occurring radionuclides with such ratios.
  • One participant expresses confusion about whether all synthetic isotopes are radioactive and questions how to identify synthetic isotopes.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the exception to the N/P ratio rule, and there are multiple viewpoints regarding the nature of synthetic isotopes and their radioactivity.

Contextual Notes

There are limitations in the discussion regarding the clarity of definitions for synthetic isotopes and the specific conditions under which certain isotopes are considered radioactive.

dionysian
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My teacher mentioned that if an element has a neutron to proton ratio of 1.2 or higher than the element is radioactive. He also said there is on exception to this when the N/P ratio is lower than 1.2, but i didnt understand him. I cannot find this one exception in my book or on the internet. Can someone please help me here?
 
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There are many synthetic isotopes with n/p < 1.2 that are beta emitters (eg: Cl-36, P-32). I don't know of any naturally occurring radionuclides with n/p < 1.2

Perhaps the folks over a Nuclear Engineering will have a better idea?
 
Yes, Yes that was it. I believe he said that if the isotope is synthetic it is radioactive. But, doesn't that meen all synthetic isotopes are radioactive. And how can i tell if a certain isotope is synthetic...? do you just have to know them or is there a trick.

Pardon my lack of chemistry knowledge, I am just starting.
 

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