Question

What do you mean by as Actinides​

Answer 1

Answer:

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What are Actinides?

The term ‘actinide series’ has been derived from the first element of the series, actinium. The symbol An is used while referring to any of the actinide series elements which range in the periodic table from atomic numbers 89 to 103.

All actinide series elements are radioactive in nature, they release a large amount of energy on radioactive decay. Uranium and thorium are the most abundant naturally occurring actinides on earth, whereas plutonium is synthetically obtained.

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Lanthanide

F Block Elements

These elements are used in nuclear reactors and nuclear weapons. Uranium and thorium have diverse current uses, whereas americium is used in ionization chambers of modern smoke detectors.

In the modern periodic table lanthanides and actinides are shown as two separate rows below the main periodic table.

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Answer 2

Answer:

Actinides are elements with atomic numbers from 90 to 103 following element Actinium. They include naturally occurring elements of thorium, protactinium and uranium and eleven transuranic i.e., artificially produced by nuclear reactions. Nevertheless, all actinides are radioactive.