Would it be some radioactive elements just decayed over millions of years ago and now we don’t know their existence (idk anything abt radioactive things , it’s just a random question popped out in my head)
Would it be some radioactive elements just decayed over millions of years ago and now we don’t know their existence (idk anything abt radioactive things , it’s just a random question popped out in my head)
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There are several extinct nucleides that we know of and that we use for research.