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प्रश्न
What are inner transition elements?
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उत्तर
The inner transition elements have two series of elements.
- Lanthanoids
- Actinoids
1. Lanthanoid series consists of 14 elements from Cerium (58Ce) to Lutetium (71Lu) following Lanthanum (57La). These elements are characterised by the preferential filling of 4f orbitals.
2. Actinoids consist of 14 elements from Thorium (90Th) to Lawrencium (103Lr) following Actinium (89Ac). These elements are characterised by the preferential filling of 5f orbital.
The elements which in their elemental or ionic form have partly filled f-orbitals are called f-block elements.
As the f-orbitals lie inner to the penultimate shell, therefore these elements having partially filled f-orbitals, are also called inner transition elements.
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संबंधित प्रश्न
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 ____________.
The actinoid elements which show the highest oxidation state of +7 are ____________.
Which one of the following is not correct?
Which of the following is not an actinoid?
The electronic configuration of gadolinium (Atomic number 64) is ______.
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.
