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Isotopes, Isotones and Isobars

Which of the ...

Question

Which of the following is not a radioactive element?

A

Uranium

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B

Helium

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C

Polonium

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D

Radium

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Solution

The correct option is B
Helium

Helium is not a radioactive element. Elements with very heavy nuclei tend to be radioactive as their nucleus is unstable.

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