+Ac (from Greek _aktis_, "ray") is a rare, silvery [radioactive](/wiki/Radioactivity) metal. It glows faintly in the dark due to its intense radioactivity, playing a key role in the study of nuclear decay and [atomic physics](/wiki/Atomic_Physics).
+## See also
+- [Element](/wiki/Element)
+- [Isotope](/wiki/Isotope)
+- [Radiation](/wiki/Radiation)
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