Nickel (Ni) – element 28
Nickel is a chemical element with the symbol Ni and atomic number 28. It is a transition metal in group 10, period 4 of the periodic table (d-block), and is a solid at room temperature.
Nickel (Ni) has atomic number 28, atomic mass 58.693 u and electron configuration [Ar] 3d8 4s2.
Nickel facts
| Symbol | Ni |
|---|---|
| Atomic number | 28 |
| Atomic mass | 58.693 u (g/mol) |
| Category | transition metal |
| Group | group 10 |
| Period | 4 |
| Block | d-block |
| Phase at 20 °C | Solid |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 4s2 3d8 |
| Noble-gas notation | [Ar] 3d8 4s2 |
| Electrons per shell | 2, 8, 16, 2 |
Bohr model and shells
Nickel has 28 electrons in 4 shells: 2, 8, 16, 2. Full configuration and noble-gas notation are in the table; work out any element or ion with the electron configuration calculator.
Physical and atomic properties
| Melting point | 1728 K (1454.8 °C) |
|---|---|
| Boiling point | 3003 K (2729.8 °C) |
| Density | 8.908 g/cm³ |
| Electronegativity (Pauling) | 1.91 |
| Electron affinity | 111.65 kJ/mol |
| Ionization energies | 737.1, 1753, 3395 kJ/mol (1st, 2nd, 3rd) |
| Molar heat capacity | 26.07 J/(mol·K) |
| Discovered by | Axel Fredrik Cronstedt |
Use the atomic mass in the molar mass calculator for any formula containing Ni.
Position in the periodic table
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Frequently asked questions
What is the atomic mass of nickel?
The atomic mass of nickel is 58.693 u, so one mole of nickel atoms weighs 58.693 g.
What is the electron configuration of nickel?
Nickel has 28 electrons: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸, or [Ar] 3d⁸ 4s² in noble-gas notation. Electrons per shell: 2, 8, 16, 2.
Is nickel a metal?
Yes. Nickel is a transition metal.
Where is nickel on the periodic table?
Nickel is in group 10, period 4, in the d-block.
Data: Periodic-Table-JSON (CC BY-SA 3.0); standard atomic weights from IUPAC (abridged). Values in brackets are the mass number of the longest-lived isotope.