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प्रश्न
Compare the chemistry of actinoids with that of lanthanoids with special reference to electronic configuration.
उत्तर
The general electronic configuration of lanthanoids is [Xe]54 4f1−14 5d0−1 6s2, while the general electronic configuration of actinoids is [Rn]86 5f1−14 6d1−2 7s2. Hence, lanthanoids belong to the 4f series and actinoids belong to the 5f series.
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संबंधित प्रश्न
What are the different oxidation states exhibited by the lanthanoids?
Write the electronic configurations of the elements with the atomic numbers 61, 91, 101 and 109.
Write the different oxidation states of iron
Explain effects of lanthanoid contraction
Account for the following:
Zn, Cd and Hg are soft metals.
What is lanthanoid contraction? Write the.............
What is meant by Lanthanide contraction? Write the general electronic configuration of inner transition elements.
General electronic configuration of actinoids is `(n-2)f^(1-14)(n - 1)d^(0-2)ns^2`.Which of the following actinoids have one electron in 6d orbital?
(i) U (Atomic no. 92)
(ii) Np (Atomic no.93)
(iii) Pu (Atomic no. 94)
(iv) Am (Atomic no. 95)
Which of the following lanthanoids show +2 oxidation state besides the characteristic oxidation state +3 of lanthanoids?
(i) \[\ce{Ce}\]
(ii) \[\ce{Eu}\]
(iii) \[\ce{Yb}\]
(iv) \[\ce{Ho}\]
Although Zr belongs to 4d and Hf belongs to 5d transition series but it is quite difficult to separate them. Why?
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 |
Match the statements given in Column I with the oxidation states given in Column II.
| Column I | Column II | |
| (i) | Oxidation state of Mn in MnO2 is | (a) + 2 |
| (ii) | Most stable oxidation state of Mn is | (b) + 3 |
| (iii) | Most stable oxidation state of | (c) + 4 |
| Mn in oxides is | (d) + 5 | |
| (iv) | Characteristic oxidation state of lanthanoids is | (e) + 7 |
Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of ______.
Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of _______.
Write any two consequences of Lanthanoid Contraction.
The lathanide ion that would show colour is ______.
Cerium (Z = S8) is an important member of lanthanoids. Which of the following statements about cerium is incorrect?
Assertion: There is a continuous increase in size among Lanthanoids with an increase in atomic number.
Reason: Lanthanoids do not show Lanthanoid contraction.
