There are naturally occurring isotopes and isotopes that are artificially produced.Isotopes are separated through mass spectrometry; MS traces show the relative abundance of isotopes vs. As mentioned before, isotopes are atoms that have the same atomic number, but different mass numbers.

Bismuth (\(^_Bi\)) has the highest atomic and mass number of all the stable nuclides.

All nuclides with atomic number and mass number greater than 83 and 209, respectively, are radioactive.

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Any object created before July 1945, then, would have neither of these elements, so finding them through mass spectrometry or other means would indicate that it was created later.

Because most elements occur as isotopes and different isotopes have different masses, the atomic mass of an element is the average of the isotopic masses, weighted according to their naturally occurring abundances; this is the mass of each element recorded on the periodic table, also known as the relative atomic mass (A).

Note: The sum of the percent natural abundances of all the isotopes of any given element must total 100%.

There are 20 elements with only artificially produced isotopes.

However, there are some lighter nuclides that are radioactive.