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D and F Block Elements question

2003 · Q90
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D and F Block Elements question

2003 · Q90

NEETChemistryD and F Block ElementsMCQ+4 / −1
The correct order of ionic radii of Y3+, La3+, Eu3+ and Lu3+ is
(Atomic nos. Y = 39, La = 57, Eu = 63, Lu = 71)
  1. A
    Y3+ < La3+ < Eu3+ < Lu3+
  2. B
    Y3+ < Lu3+ < Eu3+ < La3+
  3. C
    Lu3+ < Eu3+ < La3+ < Y3+
  4. D
    La3+ < Eu3+ < Lu3+ < Y3+
View written solutionFree

Correct answer: B

In lanthanide series there is a regular decrease in the atomic as well as ionic radii of trivalent ions (M3+) as the atomic number increases. Although the atomic radii do show some irregularities but ionic radii decreases from La(103 pm) to Lu (86pm).

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