Promethium (Pm) is a rare earth element with the atomic number 61. Here are some of its key properties:
Physical Properties:
* Appearance: Silvery white, metallic solid
* Melting point: 1042 °C (1908 °F)
* Boiling point: 3000 °C (5432 °F)
* Density: 7.26 g/cm³
* Crystal structure: Double hexagonal close-packed
* Radioactivity: All isotopes of promethium are radioactive
* Magnetic properties: Paramagnetic
Chemical Properties:
* Electron configuration: [Xe] 4f⁵ 6s²
* Oxidation states: +3 (most common), +2
* Reactivity: Highly reactive, readily forms oxides and halides
* Chemical compounds: Forms various compounds, including promethium(III) chloride (PmCl₃) and promethium(III) oxide (Pm₂O₃)
* Isotopes:
* Most stable isotope: ₁₄₇Pm with a half-life of 2.62 years
* Other isotopes: ₁⁴⁵Pm (17.7 years), ₁⁴⁶Pm (5.53 years), ₁⁴⁸Pm (5.37 years), ₁⁴⁹Pm (41.27 hours), ₁⁵⁰Pm (5.78 hours)
Other Properties:
* Occurrence: Not found naturally, only produced synthetically
* Uses:
* Radioactive sources: Used in nuclear batteries, luminous paints, and thickness gauges
* Medical applications: Used in radiography and radiation therapy
* Research applications: Used in nuclear research and as a tracer in chemical reactions
Safety Considerations:
* Radioactive hazard: All promethium isotopes are radioactive and pose a significant health hazard. Proper handling and safety precautions are essential when working with promethium.
Interesting facts:
* Promethium is named after Prometheus, a Titan in Greek mythology who stole fire from the gods to give to humanity.
* It is the only lanthanide element not found naturally.
* It is one of the most radioactive elements.
This information summarizes the key properties of promethium. For more detailed information, please refer to scientific databases and journals.
