Question

14 elements after actinium are called
(a) Lanthanides
(b) Actinides
(c) d-block elements
(d) p-blockelements

Answer 1

Answer:

The 14 elements after actinium are called as Actinoids .

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Answer 2

Answer:

The 14 elements after Actinium are called Actinides (option b).

Explanation:

Including Actinium, there are 15 elements that come under the group of Actinides. In the Periodic Table, they are the elements from atomic number 89 to atomic number 103 - atomic number 89 being Actinium and atomic number 103 being Lawrencium. All these elements are radioactive with some of the heavier elements being highly unstable.