Question

What are the proper definition of lanthanide and actinide series? ​

Answer 1

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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. Actinides are typical metals and have properties of both the d-block and the f-block elements, but they are also radioactive.

Answer 2

Explanation:

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THE 4f block elements are called lanthanides.

THE 5f block elements are called actinides.

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