Element 59
Praseodymium
Lanthanides
Praseodymium (Pr) is in the f-block of the periodic table — group 3, period 6.
Praseodymium is a chemical element with symbol Pr and atomic number 59.
Key data
- Atomic number
- 59
- Atomic mass
- 140.908 u
- Group / Period
- 3 / 6
- Block
- f-block
- Phase at STP
- Solid
- Density
- 6.77 g/cm³
- Melting point
- 934.9 °C
- Boiling point
- 3129.8 °C
- Electron configuration
- [Xe] 4f3 6s2
Periodic table block
Praseodymium is in the f-block (group 3, period 6). Elements land in the f-block when their highest-energy electrons fill an f subshell — these are the lanthanides and actinides shown beneath the main table.
New to this? Periodic table blocks explained: s, p, d, and f
Common uses
- •Aircraft engine alloys
- •Magnets
- •Welding goggle glass
Discovery
Year: 1885
Discovered by: Carl Auer von Welsbach
Frequently asked questions
What is the atomic number of Praseodymium?
Praseodymium has atomic number 59. Its symbol is Pr and its atomic mass is 140.908 u.
What category of element is Praseodymium?
Praseodymium is classified as lanthanides. It sits in group 3, period 6 of the periodic table.
What block of the periodic table is Praseodymium in?
Praseodymium is in the f-block (group 3, period 6). Its highest-energy electrons occupy the f subshell — you can see this in its electron configuration, [Xe] 4f3 6s2.
What is Praseodymium used for?
Common uses of Praseodymium include: Aircraft engine alloys, Magnets, Welding goggle glass.
When was Praseodymium discovered?
Praseodymium was discovered in 1885 by Carl Auer von Welsbach.
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