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Thanx in advance...

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- Thread starter americast
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Thanx in advance...

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Simon Bridge

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Co60 is radioactive because it is energetically favorable for it to be so.

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Out of two isotopes with same mass and whose proton number differs by one, at least one must be radioactive.

The 2 exemptions are:

Antimony-123 and tellurium-123 are both stable

Tantalum-180 and hafnium-180 are both stable (Also tungsten-180 decays by alpha decay, not electron capture as it should by Mattauch rule).

A consequence of Mattauch rule is:

By Mattauch rule, the only stable isotopes with odd number of protons and neutrons are the 4 light isotopes D, Li-6, B-10 and N-14. All others should be radioactive.

Tantalum 180 is violating Mattauch rule and so is the 5th stable odd-odd isotope. There are still just these 5. Cobalt 60 is odd-odd, and is not one of these 5 stable isotopes, so it is radioactive.

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Thanx a lot...!

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