M in 99Tc"' stands for?: (A) Micro, (B) Mega, (C) Metastable, (D) Metastatic
Answer is C. Metastable REF: Nuclear Physics: Principles And Applications by Lilley Page 20 "In 99Tcm the superscript M denotes that the technetium 99 is not in its ground state but a long lived metastable excited state"