The conclusion which can be made about isotopes is: A. Isotopes that are naturally occurring and unstable always exist in trace amounts.
Isotopes can be defined as two (2) or more forms of a chemical element that comprises equal atomic number (numbers of protons) and electrons but different numbers of neutrons.
Generally, the isotopes of a chemical element have the same chemical properties as a result of their atomic number (numbers of protons) but different physical properties because of their atomic weight (mass number).
Additionally, isotopes of a chemical element that occur naturally and are unstable always exist in trace amounts i.e they are not in abundance or much.
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