Question:
Which of the following statement is not correct
Which of the following statement is not correct
Updated On: Apr 18, 2024
- La(OH)3 is less basic than Lu(OH)3
- ) In Lanthanide series ionic radius of Ln^+3 ions decreases
- La is actually an element of transition series rather Lanthanide
- Aomic radius of Zr and Hf are same because of Lanthanide contraction
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The Correct Option is A
Solution and Explanation
The correct option is(A): La(OH)3 is less basic than Lu(OH)3.
La(OH)3 exhibits greater basicity compared to Lu(OH)3. In the lanthanide series, the basicity of hydroxides diminishes as the ionic radius decreases.
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Concepts Used:
Lanthanoids
Lanthanoids are at the top of these two-row, while actinoids are at the bottom row.
Properties of Lanthanoids
Lanthanoids are inclusive of 14 elements, with atomic numbers 58-71:
- Cerium - Xe 4f1 5d1 6s2
- Praseodymium - Xe 4f3 6s2
- Neodymium - Xe 4f4 6s2
- Promethium - Xe 4f5 6s2
- Samarium - Xe 4f6 6s2
- Europium - Xe 4f7 6s2
- Gadolinium - Xe 4f7 5d1 6s2
- Terbium - Xe 4f9 6s2
- Dysprosium - Xe 4f10 6s2
- Holmium - Xe 4f11 6s2
- Erbium - Xe 4f12 6s2
- Thulium - Xe 4f13 6s2
- Ytterbium - Xe 4f14 6s2
- Lutetium - Xe 4f14 5d1 6s2
These elements are also called rare earth elements. They are found naturally on the earth, and they're all radioactively stable except promethium, which is radioactive. A trend is one of the interesting properties of the lanthanoid elements, called lanthanide contraction.