D And F Block Elements Question 71
Question: Arrange $ C{{e}^{+3}},L{{a}^{+3}},P{{m}^{+3}} $ and $ Y{{b}^{+3}} $ in increasing order of their ionic radii
[AIEEE 2002]
Options:
A) $ Y{{b}^{+3}} \lt P{{m}^{+3}} \lt C{{e}^{+3}} \lt L{{a}^{+3}} $
B) $ C{{e}^{+3}} \lt Y{{b}^{+3}} \lt P{{m}^{+3}} \lt L{{a}^{+3}} $
C) $ Y{{b}^{+3}} \lt P{{m}^{+3}} \lt L{{a}^{+3}} \lt C{{e}^{+3}} $
D) $ P{{m}^{+3}} \lt L{{a}^{+3}} \lt C{{e}^{+3}} \lt Y{{b}^{+3}} $
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Answer:
Correct Answer: A
Solution:
Due to Lanthanoid contraction order will be $ Y{{b}^{+3}}<P{{m}^{3+}}<C{{e}^{+3}}<L{{a}^{3+}} $
BETA
