Praseodymium (Pr): electron configuration, atomic mass and facts
Praseodymium (Pr) is element 59 of the periodic table, a lanthanide in period 6 (f-block). Its electron configuration is [Xe] 4f3 6s2, with electrons arranged in shells 2, 8, 18, 21, 8, 2, and its standard atomic weight is 140.91 u.
▶ Watch Praseodymium’s electrons orbit in the interactive periodic tablePraseodymium at a glance
| Symbol | Pr |
|---|---|
| Atomic number | 59 |
| Atomic mass | 140.91 u |
| Category | Lanthanide |
| Group | f-block (no group number) |
| Period | 6 |
| Block | f-block |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f3 5s2 5p6 6s2 |
| Noble-gas shorthand | [Xe] 4f3 6s2 |
| Electrons per shell | 2, 8, 18, 21, 8, 2 |
| Electronegativity (Pauling) | 1.13 |
| State at 20 °C | solid |
Where is Praseodymium on the periodic table?
Praseodymium is in period 6 of the f-block, the lanthanide row printed below the main table. It has 6 electron shells, and this row is where the 4f subshell fills.
How to work out the electron configuration of Praseodymium
Put 59 electrons into subshells in order of rising energy, filling each before starting the next: 1s² (2), 2s² (4), 2p⁶ (10), 3s² (12), 3p⁶ (18), 4s² (20), 3d¹⁰ (30), 4p⁶ (36), 5s² (38), 4d¹⁰ (48), 5p⁶ (54), 6s² (56), 4f³ (59). In shorthand, [Xe] stands for the 54 electrons of xenon, giving [Xe] 4f³ 6s².
How electronegative is Praseodymium?
Praseodymium has a Pauling electronegativity of 1.13, ranking 83 of the 100 elements with a known value (fluorine is highest at 3.98). That is low: it tends to give up electrons and form positive ions.
Frequently asked questions
What is the electron configuration of Praseodymium?
The electron configuration of Praseodymium (Pr) is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f3 5s2 5p6 6s2. In noble-gas shorthand it is written [Xe] 4f3 6s2.
How many electrons does Praseodymium have in each shell?
Praseodymium has 59 electrons arranged in shells as 2, 8, 18, 21, 8, 2.
What is the atomic mass of Praseodymium?
The standard atomic weight of Praseodymium is 140.91 u, so one mole of Praseodymium atoms has a mass of about 140.91 g.
Is Praseodymium a metal?
Yes. Praseodymium is a lanthanide.
Explore nearby elements
More lanthanides: Lanthanum, Cerium, Neodymium, Promethium, Samarium, Europium. See all elements on the periodic table.