Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?
1.
2.
3.
4.
A pair among the following have nearly the same atomic radii:
(Numbers in the parenthesis are atomic numbers).
1. | The greater metallic character of the lanthanoids than that of the corresponding actinoids. |
2. | More energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals. |
3. | The lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals. |
4. | More active nature of the actinoids. |
Lanthanoid's most common oxidation state is:
1. 2
2. 5
3. 3
4. 4
Actinoids exhibit more oxidation states than lanthanoids. The main reason for this is:
1. | More energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals |
2. | Greater metallic character of the lanthanoids than that of the corresponding actinoids |
3. | The lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals |
4. | More active nature of the actinoids |