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[ATOM]

Promethium

[ATOM]
Information valid for Pm-145 unless otherwise noted

Basic Information


Symbol: Pm
Atomic Number: 61
Mass: (145.0)
Melting Point: Unknown
Boiling Point: Unknown
Number of Protons/Electrons: 61
Number of Neutrons: 84
Classification: Rare Earth
Crystal Structure: Hexagonal
Density @ 293 K: 6.475 g/cm3
Color: Unknown


Atomic Structure

[Bohr Model of Promethium]
Number of Energy Levels: 6

  1. First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 23
    Fifth Energy Level: 8
    Sixth Energy Level: 2

Isotopes

Isotope Half Life
Pm-143 265.0 years
Pm-144 360.0 years
Pm-145 17.7 years
Pm-146 5.53 years
Pm-147 2.62 years
Pm-148 5.37 days
Pm-148m 41.3 days
Pm-149 2.21 days
Pm-151 1.18 days

Facts


Date of Discovery: 1945
Discoverer: J.A. Marinsky
Name Origin: From the god Prometheus (who stole fire of the sky and gave it to man)
Uses: No uses known
Obtained From: fission products of uranium, thorium, plutonium