Answer: Actinides are elements 89 - 103 and fulfill their 5f sub levels progressively. The lanthanides series includes elements 58 to 71, which fill their 4f sublevel also progressively.
Explanation:
Actinides are typical metals and have properties of both the d-block and the f-block elements, but they are also radioactive. Lanthanides are any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table.
