Promethium

Statistics:

• Name: Promethium
• Symbol: Pm
• Classification: Lanthanide
• Atomic Number: 61
• Atomic Mass: 146.9151 g/mol
• Density: 7.22 g/cm³
• Melting: 1080°C
• Boiling: 2730°C
• Protons & Electrons:61
• Neutrons:84
• Discovered: 1945
• Discovered By: Marinsky and Glendenin
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Electrons Per Energy Level:

• Level 1: 2
• Level 2: 8
• Level 3: 18
• Level 4: 23
• Level 5: 8
• Level 6: 2

Isotopes:

Isotope: Half-life

• ¹⁴³Pm: 265 days
• ¹⁴⁴Pm: 363 days
• ¹⁴⁵Pm: 17.7 years
• ¹⁴⁶Pm: 5.53 years
• ¹⁴⁷Pm: 2.6234 years
• ¹⁴⁸Pm: 5.370 days
• ¹⁴⁸Pm: 41.29 days
• ¹⁴⁹Pm: 53.08 hours
• ¹⁵¹Pm: 28.40 hours

Brief Summary

Promethium is a Lanthanide with the symbol 'Pm' and contains 61 Protons & Electrons with 84 neutrons in the nucleus of the atom. Promethium has an atomic mass of 146.9151 g/mol and, at a temperature of 20°C, has a density of 7.22 g/cm³. It will melt at a temperature of 1080°C and boil at 2730°C.

Promethium was discovered by Marinsky and Glendenin in 1945 and is named 'Promethium' Prometheus, greek god who stole fire of the sky and gave it to man.

Some common usages for Promethium: currently unknown.

Definitions and Notes

Density listed is at a temperature of 20°C.

Isotopes are forms of an element who have the same atomic number but different mass because they contain different number of neutrons.

Half-life is the time required for a quantity of a subject to fall to half of its current quantity.

MLA Citing Format

Promethium :: Pm :: 61 - Chemical Element. 10 Mar. 2010 <http://www.chemicalelement.com/element/promethium.html>.