The second solution: PM is the abbreviation of English Project Management. PM means project management in Chinese.
Three solutions: PM is the abbreviation of English project manager. PM means project manager in Chinese.
Four solutions: PM is the abbreviation of English private message =PM means private information in Chinese, which means sending me a message (often used in forums).
Five solutions: PM is the abbreviation of English PageMaker. PM is typesetting software.
Six solutions: short for flattery.
Seven solutions: PM is the abbreviation of polymethyl methacrylate, and its Chinese name is polymethyl methacrylate.
Eight solutions: short for auction.
Nine solutions: PM => afternoon (AM => morning)
Ten solutions: PM is the abbreviation of English plan maintenance, which means planned maintenance in Chinese. In modern industrial factories, there are often special personnel responsible for the planned maintenance system of equipment regular maintenance.
Element symbol: Pm English name: Prometheum Chinese name: Prometheum
Relative atomic mass: 144.9 13 Ordinary valence: +3 Electronegativity: 1. 13.
Peripheral electron configuration: 4f5 6s2 Extranuclear electron configuration: 2,8,18,23,8,2.
Isotope and radiation: pm-143 [265y] pm-144 [360y] pm-145 [17.7y] pm-146 [5.53y]. Pm- 148m[4 1.3d]Pm- 149[2.2 1d]Pm- 15 1[ 1. 18d]
Electron affinity energy and energy: 0 kj mol-1.
The first ionization energy is 535kJ mol- 1, the second ionization energy is 1052kJ mol- 1, and the third ionization energy is 0kJ mol- 1.
Element density: 6.475 g/cm3 Element melting point: 1042.0℃ Element boiling point: 3000.0℃
Atomic radius: 2.62 angstrom; Ion radius: 1.09(+3) angstrom; Covalent radius: 1.63 angstrom.
Common compounds: unknown
Discoverer: mullins, Kiglan Downing, Corell Time: 1945 Location: USA.
Name source:
Named after Prometheus in Greek mythology.
Element description:
Originally produced in stars, promethium on the earth has many origins.
Element source:
It does not exist in nature, but is produced in the fission products of uranium, thorium and plutonium.
Element usage:
Used as a ray source for thickness gauge.