Which one of the following is not radioactive?

Astatine

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Francium

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Tritium

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Zirconium

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Solution

The correct option is A Zirconium
Zirconium is not radioactive.

Zr, the heaviest isotope of zirconium, is the most radioactive, with an estimated half-life of 30 milliseconds. Radioactive isotopes at or above mass number 93 decay by electron emission, whereas those at or below 89 decay by positron emission.

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