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प्रश्न
Why do zirconium and Hafnium exhibit similar properties?
Explain why Zr and Hf exhibit similar properties.
(At. no. of Zr = 40, Hf = 72)
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उत्तर
- The elements of the second and third transition series resemble each other more closely than the elements of the first and second transition series due to lanthanoid contraction.
- e.g., Zr-4d series -Atomic radius 145 pm Hf-5d series – Atomic radius 144 pm
- The radii are very similar, even though the number of electrons increases.
- Zr and Hf have very similar chemical behaviour, having closely similar radii and electronic configurations.
- Radius-dependent properties such as lattice energy and solvation energy are similar.
- Thus, lanthanide contraction leads to the formation of pairs of elements and those known as chemical twins, e.g., Zr-Hf
संबंधित प्रश्न
Which of the following oxidation states is most common among the lanthanoids?
Assertion: Ce4+ is used as an oxidizing agent in volumetric analysis.
Reason: Ce4+ has the tendency of attaining +3 oxidation state.
The most common oxidation state of actinoids is ____________.
Which one of the following is not correct?
Compare lanthanoids and actinoids.
Which of the following is not an actinoid?
The electronic configuration of gadolinium (Atomic number 64) is ______.
The elements in which electrons are progressively filled in 4f-orbital are called ______.
In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz, s, p, d and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Arfbau principle, the seven periods have 2, 8, 8, 18, 18, 32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.
Which of the elements whose atomic numbers are given below, cannot be accommodated in the present set-up of the long form of the periodic table?
Electronic configurations of four elements A, B, C and D are given below:
(A) 1s22s22p6
(B) 1s22s22p4
(C) 1s22s22p63s1
(D) 1s22s22p5
Which of the following is the correct order of increasing tendency to gain electron:
