Francium Electron Configuration
Orbital diagram
- Valence electrons
- 1
- Unpaired electrons
- 1
- Block
- s-block
- Magnetism (atom)
- paramagnetic
Electrons per shell
| K (n = 1) | 2 |
|---|---|
| L (n = 2) | 8 |
| M (n = 3) | 18 |
| N (n = 4) | 32 |
| O (n = 5) | 18 |
| P (n = 6) | 8 |
| Q (n = 7) | 1 |
Francium ion configurations
| Ion | Electrons | Configuration |
|---|---|---|
| Fr+ | 86 | [Xe] 4f14 5d10 6s2 6p6 |
How to write it
Place 87 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. Francium sits in period 7, group 1, in the s-block, so its last electron enters an s subshell. Replacing the inner electrons with the previous noble gas gives the shorthand [Rn] 7s1.
Try francium and its ions in the calculator, or see the full francium data sheet.
Francium electron configuration FAQ
What is the electron configuration of francium?
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s² 6p⁶ 7s¹. Shorthand (noble gas) notation: [Rn] 7s¹.
What is the noble gas configuration of francium?
[Rn] 7s¹. The bracket stands for the Rn core electrons.
How many valence electrons does francium have?
1 (outer shell (n = 7)).
How many unpaired electrons does francium have?
1 in the ground state, following Hund’s rule. An atom with unpaired electrons is paramagnetic.
What is the electron configuration of Fr+?
[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁶ (86 electrons).