Question

The correct order of ionic radii of y3+, la3+, eu3+ and lu+3 is :-

Answer 1

Answer:

Y3+<Lu3+<Eu3+<La3+

Explanation:

Answer 2

The correct order of ionic radii is $La^{3+}>Y^{3+}>Eu^{3+}>Lu^{3+}$.

Explanation:

• The principle involved to solve this is that, from group 1 to group 18, the ionic radii decreases, whereas from period 1 to period 7 it increases.
• As the ions given have the same charges, its location in the periodic table is required to arrange them in the correct order.
• Accordingly, in the periodic table, in group 3, Y is located above La, which means that La has high ionic radii than Y.
• The element Eu is located before Lu. This means that Ionic radii of Eu is more than that of Lu.
• Thus the correct order of ionic radii is $La^{3+}>Y^{3+}>Eu^{3+}>Lu^{3+}$.

Learn more about ionic radii

The ionic radii of A+ and B– ions are 0.98×10–10 m and 1.81×10–10 m. The coordination number of each ion in AB is :

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If the ionic radii of K+ and F- are nearly the same (i.e, 1.34 angstrom), then the atomic radii of K and F respectively are :

1) 1.34 °A , 1.34 °A

2) 0.72 °A , 1.96 °A

3) 1.96 °A , 0.72 °A

4) 1.96 °A , 1.34 °A

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