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🔬 Science & TechnologyUPSC 2001Space & Space Technology

Which one of the following is NOT radioactive?

aAstatine
bFrancium
cTritium
dZirconium
✓ Correct answer: d) Zirconium
ExplanationAstatine, Francium, and Tritium are radioactive elements: Astatine is a halogen with no stable isotopes.Francium is an alkali metal, highly unstable and radioactive.Tritium is a radioactive isotope of hydrogen.Zirconium is not radioactive.It is a stable, non-radioactive metal widely used in industries like nuclear reactors and construction.306

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