Chemical Elements.com - Praseodymium (Pr)

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Basic Information

Name: Praseodymium
Symbol: Pr
Atomic Number: 59
Atomic Mass: 140.90765 amu
Melting Point: 935.0 °C (1208.15 K, 1715.0 °F)
Boiling Point: 3127.0 °C (3400.15 K, 5660.6 °F)
Number of Protons/Electrons: 59
Number of Neutrons: 82
Classification: Rare Earth
Crystal Structure: Hexagonal
Density @ 293 K: 6.77 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
Pr-141	Stable
Pr-142	19.12 hours
Pr-143	13.57 days
Pr-144	17.28 minutes
Pr-145	7.2 minutes

Facts

Date of Discovery: 1885
Discoverer: C.F. Aver von Welsbach
Name Origin: From the Greek words prasios (green) and didymos (twin)
Uses: coloring glass and ceramics
Obtained From: salts

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