Promethium — Pm

The chemical element Promethium is an element of type Metal lanthanides with the symbol Pm. It has an atomic mass of 145 u and an electronic configuration of [Xe] 4f5 6s2.
Synthétique Radioactif Liquide Gaz

1080°
2730°

145

2
8
18
23
8
2

[Xe] 4f5 6s2

1.13

5.582

Electronic configuration diagram

characteristics

Atomic number: 61
Atomic mass: 145
Symbol: Pm
Melting point: 1080
Boiling point: 2730
Density: 7.26
Period: 6
Group: 0
Discovery: 1945 Marinsky et al.
Abundance: 0.001
Radius: 2.6
Electronegativity: 1.13
Ionization: 5.582
Isotope: 14
Electronic configuration: [Xe] 4f5 6s2
Oxidation state: 3
Electron: 2,8,18,23,8,2

Promethium (chemical symbol: Pm) is a radioactive chemical element that is found in the lantanide group of metals. It has the atomic number 61 and an atomic weight of 145. It is very rare in nature and must be synthesized to obtain. Characteristics – promethium has an oxidation state of +3 and occurs as a soft, ductile metal. Its density is 7.26 g/cm3 and its melting temperature is 1100°C. Properties – promethium is the only chemical element that is totally radioactive. It degrades by producing alpha, beta and gamma rays. It degrades very rapidly and its degradation products are not stable. Uses – promethium is primarily used as an energy source in special atomic batteries, which power certain medical and space applications. In addition, its radioactivity is used in different types of analytical tests, as this allows specific elements to be identified. Finally, it is used in certain medical studies and radiotherapy applications.