The lanthanide contraction is responsible for the fact that:

1. Zr and Y have about the same radius .

2. Zr and Zn have the same oxidation state.  

3. Zr and Hf have about the same atomic radius .

4. Zr and Nb have a similar oxidation state.

Subtopic:  Lanthanoid & Actinoids Contraction |
 93%
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The incorrect statement among the following is:  

1. There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
2. Lanthanoid contraction is the accumulation of successive shrinkages.
3. As a result of lanthanoid contraction, the properties of the 4d series of the transition elements have no similarities with the 5d series of elements.
4. The shielding power of 4f electrons is quite weak.

Subtopic:  Lanthanoid & Actinoids Contraction |
 85%
From NCERT
AIPMT - 2007
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The reason for lanthanoid contraction is:

1. Negligible screening effect of 'f' orbitals

2. Increasing nuclear charge

3. Decreasing nuclear charge

4. Decreasing screening effect

Subtopic:  Lanthanoid & Actinoids Contraction |
 74%
From NCERT
NEET - 2014
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Actinide contraction is mainly related to:
1. Poor shielding by 5f subshell
2. Extraordinary decrement in Zeff
3. Both (1) and (2)
4. Strong shielding by 5f subshel

Subtopic:  Lanthanoid & Actinoids Contraction |
 63%
From NCERT
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