Question

What are lanthanoids and actinoids called.. *​

Answer 1

Answer:

The lanthanide and actinide series make up the inner transition metals. The lanthanide series includes elements 58 to 71, which fill their 4f sublevel progressively. The actinides are elements 89 to 103 and fill their 5f sublevel progressively.

Answer 2

Answer:

The lanthanides and actinides together are sometimes called the inner transition elements.