A) Am
B) Cm
C) Fm
D) Tm
Correct Answer: D
Solution :
Am \[\xrightarrow{{}}\] Americium \[\xrightarrow{{}}\] At. no. = 95 Cm \[\xrightarrow{{}}\] Curium \[\xrightarrow{{}}\] At. no. = 96 Fm \[\xrightarrow{{}}\] Fermium \[\xrightarrow{{}}\] At no. = 100 All are actinides because they are present in seventh period of periodic table from atomic number 89 (Actinium) to atomic number ?103 (Lawrencium) Tm \[\to \] Thulium ? At. no. 69. It is a lanthanide because lanthanides are present in sixth period of periodic table from atomic number 57 (Lanthanum) to atomic number 71 (Lutetium).
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