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प्रश्न
The electronic configuration of gadolinium (Atomic number 64) is ______.
पर्याय
[Xe] 4f3 5d5 6s2
[Xe] 4f7 5d2 6s1
[Xe] 4f7 5d1 6s2
[Xe] 4f8 5d6 6s2
[Xe] 4f8 5d9 6s2
[Xe] 4f6 5d2 6s2
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उत्तर
The electronic configuration of gadolinium (Atomic number 64) is [Xe] 4f7 5d1 6s2.
Explanation:
The electronic configuration of La (Z = 57) is [Xe] 5d1 6s2. Therefore, further addition of electrons occurs in the lower energy 4f-orbital till it is exactly half-filled at Eu (Z = 63). Thus, the electronic configuration of Eu is [Xe] 4f7 6s2. Thereafter, the addition of the next electron does not occur in the more stable, exactly half-filled 4f7 shell but occurs in the slightly higher energy 5d-orbital. Thus, the electronic configuration of Gd (Z = 64) is [Xe] 4f7 5d1 6s2.
संबंधित प्रश्न
Which one of the following statements related to lanthanons is incorrect?
Which of the following lanthanoid ions is diamagnetic?
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 ____________.
What are actinoids? Give three examples.
What is lanthanoid contraction and what are the effects of lanthanoid contraction?
Compare lanthanoids and actinoids.
Actinoid contraction is greater from element to element than the lanthanoid contraction, why?
Why do zirconium and Hafnium exhibit similar properties?
Which of the following is not an actinoid?
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.
The element with atomic number 57 belongs to ______.
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.
The elements with atomic numbers 35, 53 and 85 are all ______.
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:
Illustrate by taking examples of transition elements and non-transition elements that oxidation states of elements are largely based on electronic configuration.
Electronic configuration, [Ne] 3s2 3p4 is for ______.
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: Size of Bk3+ ion is less than Np3+ ion.
Reason R: The above is a consequence of the lanthanoid contraction.
In the light of the above statements, choose the correct answer from the options given below.
