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I expect that the answer that you are required to give is the mass. However, the mass of any radioactive object is very definitely not an unchanging measure. And even with non-radioactive materials, some Grand Unified Theories (GUTs) of matter suggests that protons themselves might decay with a half life of over ten decillion years! While that is hugely greater than the 14.5 years that the universe has been in existence, it is not unchanging - if true.

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10y ago

What else can I help you with?