Lanthanoids are - Vidyadip

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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