Potential answers for "They may be radioactive"

⭐⭐⭐⭐ ISOTOPES
⭐⭐ FERMIUM
⭐⭐ UNSTABLE
⭐⭐ BETARAY
⭐⭐ HALFLIVES
⭐⭐ ASTATINE
⭐⭐ HALFLIFE
⭐⭐ URANIUM
⭐⭐ ACTINIDES
⭐⭐ DECAY

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