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The atomic numbers of the f-block elements are:

$\begin{array}{1 1}(a)\;58\;to\;71&(b)\;90\;to\;103\\(c)\;Both\;(a)\;and\;(b)&(d)\;None\end{array}$

1 Answer

58 to 71 and 90 to 103 (Lanthanides & actinides).
The group of 14 elements from Cerium(58) to Lutetium(71) are placed alongwith lanthanum in IIIB group and in the 6th period of the periodic table in a series below the periodic table called as Lanthanides.
The group of 14 elements from Thorium(90) to Lawrencium(103) are placed alongwith Actinum in IIIB group and in the 7th period of the periodic table in a series below the periodic table called as Actinides.
answered Jan 30, 2014 by sreemathi.v
edited Oct 22 by sharmaaparna1
 

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