Atomic Number
59
Element 59
Praseodymium (Pr)
Praseodymium is a chemical element with symbol Pr and atomic number 59. It is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals.
Atomic Mass
140.91 u
Category
Lanthanide
Period
6
Group
Lanthanide series
Phase
solid
Density
6.77 g/cm3
Electron Shells
2, 8, 18, 21, 8, 2
Atomic Structure
Protons: 59. Electrons: 59. Neutrons: Varies by isotope.
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f³
Why Praseodymium Matters
Praseodymium helps connect atomic number 59, lanthanide behavior, period 6 trends, and electron shell structure. Its solid phase, atomic mass of 140.91 u, and electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f³ make it useful for comparing bonding patterns across the periodic table.
Discovery and Occurrence
Praseodymium was discovered 1885 by Carl Auer von Welsbach. Praseodymium is a chemical element with symbol Pr and atomic number 59. It is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals.
Safety and Handling Context
Praseodymium is presented here for learning and comparison. Pure elements and laboratory compounds can have hazards that depend on dose, form, and setting.
Related Elements
Frequently Asked Questions
- What is the atomic number of Praseodymium?
- Praseodymium has atomic number 59, which means a neutral atom has 59 protons and 59 electrons.
- What is the chemical symbol for Praseodymium?
- The chemical symbol for Praseodymium is Pr.
- What category is Praseodymium in?
- Praseodymium is classified as a lanthanide and sits in period 6 of the periodic table.
Explore Praseodymium in 3D
Use the interactive table above to rotate atomic models, compare periodic trends, and move from Praseodymium to neighboring elements without losing your place.