Assertion: astatine's use | /r/HasProperty | m
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Source sentences:
text: The nuclear isomer article indicates that "m1" is not used, just "m", "m2", etc; a note may also be necessary to clarify exactly what astatine-202m1 means (first meta-state nuclear isomer of astatine-202)}} -- Half the truth, not always used, but sometimes is in scientific literature; the article itself names an isotope in that way.