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D and F Block Elements question

2004 · Q93
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D and F Block Elements question

2004 · Q93

NEETChemistryD and F Block ElementsMCQ+4 / −1
lanthanoids are
  1. A
    14 elements in the sixth period (atomic no. 90 to 103) that are filling 4f sublevel
  2. B
    14 elements in the seventh period (atomic number = 90 to 103) that are filling 5f sublevel
  3. C
    14 elements in the sixth period (atomic number = 58 to 71) that are filling the 4f sublevel
  4. D
    14 elements in the seventh period (atomic number = 50 to 71) that are filling 4f sublevel.
View written solutionFree

Correct answer: C

As sixth period can accommodate only 18 elements in the table, 14 members of 4f series (atomic number 58 to 71) are separately accommodated in a horizontal row below the periodic table. These are called as lanthanides.

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