👉 Carchesium is a naturally occurring radioactive element with the atomic number 78, designated by the symbol Cs in atomic notation. It has a half-life of approximately 140 years and is found primarily in the Earth's crust.
👉 Carchesium is a naturally occurring radioactive element with the atomic number 78, designated by the symbol Cs in atomic notation. It has a half-life of approximately 140 years and is found primarily in the Earth's crust.
