🧪⏳☢️
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#chemical element
#unstable
#short half-life
#radioactive decay
#halogen group
#element 85
☢️📉At
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#unstable element
#radioactive decay
#element symbol
#at
#element 85
#astatos
8️⃣5️⃣☢️
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#atomic number 85
#element 85
#radioactive element
⚛️🧪8️⃣5️⃣
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#astatine
#element 85
#physics discovery
#element discovery
#berkeley
☢️✨🧂
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#radioactive
#rare element
#halogen
#element 85
#radioactivity
#chemical element #unstable #short half-life #radioactive decay #halogen group #element 85