🪨➡️☢️₂₂₂

#radon #radioactive decay #natural radioactivity #uranium decay chain #rn-222 #rock gas

✨☢️⚛️

#rare element #radioactive #element 87 #unstable #alkali metal #natural radioactivity #FR

🌍💎☢️

#rarest element #earth crust #natural radioactivity #scarce element #element 85