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4. d and f- block elements — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
Lanthanoids are
  • ✓
    $14$  elements in the sixth period (atomic no.$ = 58$  to  $71$) that are filling $4f$ sublevel
  • B
    $14$  elements in the seventh period (atomic no. $= 58$  to $ 71$) that are filling $4f$  sublevel
  • C
    $14 $ elements in the sixth period (atomic no. $= 90$  to $103$) that are filling 4f sublevel
  • D
    $14$  elements in the seventh period (atomic no. $ = 90$  to $103$) that are filling $ 4f$  sublevel
✓

Answer

Correct option: A.
$14$  elements in the sixth period (atomic no.$ = 58$  to  $71$) that are filling $4f$ sublevel
a
(a)As sixth period can accommodate only $18 $ element in the table, $ 14$  member of $HF$  series (atomic number $58 $ ot $71$) are separately accommodated in a horizontal row below the periodic table. These are called as lanthanides.

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