- 1(current)
Q. No.The decrease in size from left to right in the actinoid series is greater and more gradual than that in the lanthanoid series due to:
| 1. | 4f orbitals are penultimate |
| 2. | 4f orbitals have a greater shielding effect |
| 3. | 5f orbitals have a poor shielding effect |
| 4. | 5f orbitals have a greater shielding effect |
Subtopic: Â Lanthanoid & Actinoids Contraction |
 76%
From NCERT
NEET - 2022
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Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of:
1. Lanthanoid contraction
2. Having similar chemical properties
3. Belonging to the same group
4. Diagonal relationship
Subtopic: Â d-Block Elements- Properties & Uses |Â Lanthanoid & Actinoids Contraction |
 87%
From NCERT
NEET - 2021
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Identify the incorrect statement from the following:
| 1. | Zirconium and Hafnium have identical radii of 160 pm and 159 pm, respectively as a consequence of lanthanoid contraction. |
| 2. | Lanthanoids reveal only +3 oxidation state. |
| 3. | The lanthanoid ions other than the f0 type and the f14 type are all paramagnetic. |
| 4. | The overall decrease in atomic and ionic radii from lanthanum to lutetium is called lanthanoid contraction. |
Subtopic: Â Lanthanoid & Actinoids Contraction |
 68%
From NCERT
NEET - 2020
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- 1(current)
Q. No.
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