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Question

Most of the radio active elements are present in__________

A
Lanthanoids
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B
Actinoids
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C
Representative elements
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D
Second transition series
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Solution

The correct option is C Actinoids
The actinoids are radioactive elements and the earlier members have relatively long half-lives.

The most common and known element is Uranium, which is used as nuclear fuel when its converted into plutonium, through a nuclear reaction.

Option B is correct.

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