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प्रश्न
Compare lanthanoids and actinoids.
उत्तर
| Sr. No. | Lanthanoids | Actinoids |
| 1. | The differentiating electron enters in 4f orbital. | The differentiating electron enters in 5f orbital. |
| 2. | Binding energy of 4f orbitals are higher. | Binding energy of 5f orbitals are lower. |
| 3. | They show less tendency to form complexes. | They show greater tendency to form complexes. |
| 4. | Most of the lanthanoids are colourless. | Most of the actinoids are coloured. For example, U3+ (red), U4+ (green), \[\ce{UO^2+_2}\] (yellow) |
| 5. | They do not form oxo cations. | They do form oxo cations such as \[\ce{UO^2+_2}\] \[\ce{NpO^2+_2}\] etc |
| 6. | Besides +3 oxidation states, lanthanoids show +2 and +4 oxidation states in few cases. | Besides +3 oxidation states, actinoids show higher oxidation states such as +4, +5, +6 and +7. |
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संबंधित प्रश्न
Which of the following lanthanoid ions is diamagnetic?
Which of the following oxidation states is most common among the lanthanoids?
The most common oxidation state of actinoids is ____________.
What are inner transition elements?
What are actinoids? Give three examples.
What is lanthanoid contraction and what are the effects of lanthanoid contraction?
Out of Lu(OH)3 and La(OH)3 which is more basic and why?
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.
The elements with atomic numbers 35, 53 and 85 are all ______.
Illustrate by taking examples of transition elements and non-transition elements that oxidation states of elements are largely based on electronic configuration.
