Question

Write any three differences between Lanthanoid and Actinoid.

Hint:

Lanthanoids are known for their applications in optics and magnets, while actinoids are critical in nuclear energy and weapons.

Answer 1

Step 1: Difference between Lanthanoid and Actinoid.
1. Lanthanoids are the 15 elements with atomic numbers 57 to 71, from Lanthanum (La) to Lutetium (Lu), and are also known as the rare earth elements. Actinoids, on the other hand, are the 15 elements with atomic numbers 89 to 103, from Actinium (Ac) to Lawrencium (Lr).
2. Lanthanoids are less radioactive compared to Actinoids, and many of the actinoids are highly radioactive, with elements like Uranium and Thorium being used as nuclear fuel.
3. Lanthanoids generally exhibit a +3 oxidation state, while Actinoids can exhibit a wider range of oxidation states, including +3, +4, and even +5.

Step 2: Conclusion.
The lanthanoids and actinoids differ in their atomic number range, radioactivity, and oxidation states.