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प्रश्न
What is meant by Lanthanide contraction? Write the general electronic configuration of inner transition elements.
उत्तर
Lanthanide contraction
It is the slow or gradual decrease in the sizes of atoms or tri positive ions of lanthanide as we move from left to right along the lanthanides.
General electronic configuration of inner transition elements is
[Xe]54 4f1-14 5d0-1 6s2 – For lanthanides
[Rn]86 5f1-14 6d0-1 7s2 – For actinides
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संबंधित प्रश्न
Define lanthanoid contraction.
Write the electronic configurations of the elements with the atomic numbers 61, 91, 101 and 109.
Explain effects of lanthanoid contraction
Account for the following:
Zn, Cd and Hg are soft metals.
Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?
Match the compounds/elements given in Column I with uses given in Column II.
| Column I (Compound/element) | Column II (Use) | |
| (i) | Lanthanoid oxide | (a) Production of iron alloy |
| (ii) | Lanthanoid | (b) Television screen |
| (iii) | Misch metal | (c) Petroleum cracking |
| (iv) | Magnesium based alloy is constituent of | (d) Lanthanoid metal + iron |
| (v) | Mixed oxides of lanthanoids are employed | (e) Bullets |
| (f) In X-ray screen |
On the basis of Lanthanoid contraction, explain the following:
Nature of bonding in \[\ce{La2O3}\] and \[\ce{Lu2O3}\] .
On the basis of Lanthanoid contraction, explain the following:
Trends in acidic character of lanthanoid oxides.
Zr(Z = 40) and Hf(Z = 72) have similar atomic and ionic radii because of ______
Why is Mn2+ ion more stable than Fe2+ ion?
(Atomic numbers of Mn = 25 and Fe = 26)
