Promethium Electron Configuration
Orbital diagram
- Valence electrons
- 2
- Unpaired electrons
- 5
- Block
- f-block
- Magnetism (atom)
- paramagnetic
Electrons per shell
| K (n = 1) | 2 |
|---|---|
| L (n = 2) | 8 |
| M (n = 3) | 18 |
| N (n = 4) | 23 |
| O (n = 5) | 8 |
| P (n = 6) | 2 |
Promethium ion configurations
| Ion | Electrons | Configuration |
|---|---|---|
| Pm3+ | 58 | [Xe] 4f5 |
How to write it
Place 61 electrons into subshells in the Aufbau order (1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p), filling s with 2, p with 6, d with 10 and f with 14. Promethium sits in period 6, in the f-block, so its last electron enters a f subshell. Replacing the inner electrons with the previous noble gas gives the shorthand [Xe] 4f5 6s2.
Try promethium and its ions in the calculator, or see the full promethium data sheet.
Promethium electron configuration FAQ
What is the electron configuration of promethium?
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f⁵ 6s². Shorthand (noble gas) notation: [Xe] 4f⁵ 6s².
What is the noble gas configuration of promethium?
[Xe] 4f⁵ 6s². The bracket stands for the Xe core electrons.
How many valence electrons does promethium have?
2 (2 in the outer s subshell).
How many unpaired electrons does promethium have?
5 in the ground state, following Hund’s rule. An atom with unpaired electrons is paramagnetic.
What is the electron configuration of Pm3+?
[Xe] 4f⁵ (58 electrons).