59
Pr
140.91
Praseodymium (Pr)
Element 59 · Period 6 · Lanthanide series
lanthanide
solid at room temp
f-block
About Praseodymium
Rare earth used in high-strength magnets, aircraft engines, and green glass coloring.
Physical Properties
Atomic Mass
140.91 u
State at 25°C
Solid
Melting Point
931 °C
Boiling Point
3520 °C
Density
6.773 g/cm³
Magnetism
Paramagnetic
Atomic Properties
Electron Configuration
[Xe] 4f³ 6s²
Electron Shells
2, 8, 18, 21, 8, 2
Electronegativity
1.13
Atomic Radius
239 pm
Ionization Energy
527 kJ/mol
Oxidation States
+3
Discovery & History
Discovered By
Carl Auer von Welsbach
Discovery Year
1885
Named By
Carl Auer von Welsbach
Name origin: Greek: prasinos (green) + didymos (twin)
Frequently Asked Questions
- Is Praseodymium a metal, nonmetal, or metalloid?
- Praseodymium is classified as a lanthanide.
- What state is Praseodymium in at room temperature?
- Praseodymium is a solid at standard room temperature (25°C).
- What is the atomic mass of Praseodymium?
- Praseodymium has an atomic mass of 140.91 atomic mass units (u).
- Who discovered Praseodymium?
- Praseodymium was discovered by Carl Auer von Welsbach in 1885.
- Where is Praseodymium on the periodic table?
- Praseodymium is element number 59, located in period 6, part of the lanthanide series shown below the main table.