Actinium (Ac)
Actinium is a radioactive element that gives its name to the actinide series. It glows pale blue in the dark.
Properties of Actinium
- Atomic number
- 89
- Category
- Actinide
- Atomic mass
- 227 u
- Electron configuration
- [Rn] 6d¹ 7s²
- Melting point
- 1500 K (1226.85 °C)
- Boiling point
- 3500 K (3226.85 °C)
- Density
- 10.07 g/cm³
- Electronegativity (Pauling)
- 1.1
- Appearance
- Silvery-white metallic
- Discovered by
- Friedrich Oskar Giesel (1899)
Facts about Actinium
- Actinium glows pale blue in the dark due to its intense radioactivity!
- The entire actinide series is named after actinium!
- Actinium is about 150 times more radioactive than radium!
- Actinium is being researched for targeted cancer therapy!