Question

What are lanthanides and Actirides?​

Answer 1

Answer:

1. The first series of elements are called lanthanides and include elements with atomic numbers beginning from 57 and ending at 71. These elements are non-radioactive (except for promethium, which is radioactive).
2. The second series of elements are called actinides and include elements with atomic numbers beginning from 89 and ending at 103. These elements generally have a radioactive nature.

Answer 2

Correction:

It should be Actinides instead of Actirides.

Explanation:

Lanthanides and Actinides are the elements of f-block of the periodic table.

actinides are all radioactive where as no lanthanide except promethium is radioactive.

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