Full configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s²
In the short form, [Xe] stands for the 54 electrons of xenon, the noble gas before mercury. Only the electrons after it are written out.
Orbital diagram
Outer subshells only. Each box is an orbital; electrons fill singly first (Hund's rule), then pair up with opposite spins.
What the configuration tells you
Mercury has full 5d¹⁰ and 6s² subshells, held tightly enough that it's a liquid at room temperature.
Configuration of mercury ions
| Ion | Configuration | Unpaired | Moment (BM) |
|---|---|---|---|
| Hg²⁺ | [Xe] 4f¹⁴ 5d¹⁰ | 0 | 0.00 |
Moment is the spin-only magnetic moment μ = √(n(n + 2)) Bohr magnetons, where n is the number of unpaired electrons. Positive ions lose electrons from the outermost shell first, so transition metals lose their 4s or 5s electrons before d.
Nearby elements
| Z | Element | Configuration |
|---|---|---|
| 77 | Iridium | [Xe] 4f¹⁴ 5d⁷ 6s² |
| 78 | Platinum | [Xe] 4f¹⁴ 5d⁹ 6s¹ |
| 79 | Gold | [Xe] 4f¹⁴ 5d¹⁰ 6s¹ |
| 81 | Thallium | [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹ |
| 82 | Lead | [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p² |
| 83 | Bismuth | [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p³ |
Questions students ask
What is the electronic configuration of mercury?
[Xe] 4f¹⁴ 5d¹⁰ 6s², or in full, 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6s². Mercury has atomic number 80.
How many electrons are in each shell of mercury?
2, 8, 18, 32, 18, 2 (K, L, M, N… shells in order).
How many unpaired electrons does mercury have?
0 in the ground state, so mercury atoms are diamagnetic.
What is the electronic configuration of Hg²⁺?
[Xe] 4f¹⁴ 5d¹⁰, with 0 unpaired electrons.