Chemical Elements.com - Promethium (Pm)

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Basic Information

Name: Promethium
Symbol: Pm
Atomic Number: 61
Atomic Mass: (145.0) amu
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

Number of Energy Levels: 6

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

Sixth Energy Level:

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

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