As atomic number increases, the ionic radii of `Ln ^(3+)` ion

Question

As atomic number increases, the ionic radii of `Ln ^(3+)` ion

As atomic number increases, the ionic radii of `Ln ^(3+)` ion
A. increases
B. first increases and then decreases
C. decreases
D. first decreases and then increases

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct Answer - C
We know that from` Ce ^(3+)` to `Lu^(3+)` ion nucleus charge increase. The 4f orbitals are not able to shield perfectly the attraction between nucleus and outer most electronic orbit. Thus increased nuclear charge is more than that of shielding effect of 4f electrons. Hence from `Ce ^(3+)` to `Lu^(3+)` ionic radii decreases.