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Radon (86)
Periodic Table's 86 th atom is Radon This atom is a radioactive gas, short-lived, It is used for environmental hazard, surgical implants for cancer treatment.
Francium (87)
Periodic Table's 87 th atom is Francium This atom is a radioactive, short-lived, Small traces in nature.
Radium (88)
Periodic Table's 88 th atom is Radium This atom is a radioactive, long-lived, It is used luminous watches (now banned), medical radon production and radiography.
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