Which among the following elements is radioactive?

L a

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T m

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P m

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P r

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Solution

The correct option is C $P m$
All isotope of Promethium ( $P m$ ) are radioactive.
option C is correct

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Which of the following is not a radioactive element?

The symbols given below represents the nuclei of radioactive elements. Which among the following are isotopes?

$_{91}^{230} W$ , $_{92}^{235} X$ , $_{93}^{238} Y$ , $_{92}^{238} Z$

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