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#promethium
#synthetic element
#radioactive
#rare earth element
#lanthanide
#man-made element
#element 61
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#promethium
#prometheus
#element 61
#titan
#radioactive element
#pm
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#promethium
#element 61
#atomic number 61
#radioactive
#prometheus
#nuclear energy
#pm
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#promethium
#element 61
#radioactive element
#lanthanide
#pm
#chemical element
#nuclear physics
#promethium #synthetic element #radioactive #rare earth element #lanthanide #man-made element #element 61