Silva, Robert J. (2011). "Chapter 13. Fermium, Mendelevium, Nobelium, and Lawrencium". In Morss, Lester R.; Edelstein, Norman M. and Fuger, Jean (ed.). The
ପରମାଣୁ କ୍ରମାଙ୍କ ୧୦୦ । Robert J. Silva: Fermium, Mendelevium, Nobelium, and Lawrencium Archived 2010-07-17 at the Wayback Machine., in: Lester R. Morss, Norman
an alkali metal. b Group 3: depending on the source: Lutetium (Lu) and Lawrencium (Lr) may be included; the f-block (with 14 lanthanides and 14 actinides)