Question

What are actinoids and why are they called so?

Answer 1

1. Actinoids are a series of 14 elements where the differentiating electrons enter the 5f-subshell.
2. They are inner transition elements found in the f-block of the periodic table.
3. These elements follow actinium (Ac) and have similar physical and chemical properties.
4. They are called actinoids because they closely resemble actinium in characteristics.