Definition: Actinium, also known as uranium, is a highly radioactive element with a mass number 92 and an atomic number 94. The actinium nucleus has an electron configuration of 123, which means it contains three protons and three neutrons in the same orbital. This can cause atoms to behave like nuclei for very long periods of time. Actinium is widely used as a source of gamma radiation because it has a relatively short half-life (approximately 7 minutes). This makes it an ideal source for medical applications, such as imaging procedures or cancer treatment.
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