Nitrogen (N) – element 7
Nitrogen is a chemical element with the symbol N and atomic number 7. It is a reactive nonmetal in group 15 (pnictogens), period 2 of the periodic table (p-block), and is a gas at room temperature.
Nitrogen (N) has atomic number 7, atomic mass 14.007 u and electron configuration [He] 2s2 2p3.
Nitrogen facts
| Symbol | N |
|---|---|
| Atomic number | 7 |
| Atomic mass | 14.007 u (g/mol) |
| Category | reactive nonmetal |
| Group | group 15 (pnictogens) |
| Period | 2 |
| Block | p-block |
| Phase at 20 °C | Gas |
| Electron configuration | 1s2 2s2 2p3 |
| Noble-gas notation | [He] 2s2 2p3 |
| Electrons per shell | 2, 5 |
| Valence electrons | 5 |
Bohr model and shells
Nitrogen has 7 electrons in 2 shells: 2, 5. 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 | 63.15 K (-210.0 °C) |
|---|---|
| Boiling point | 77.355 K (-195.8 °C) |
| Density | 1.251 g/L |
| Electronegativity (Pauling) | 3.04 |
| Electron affinity | -6.8 kJ/mol |
| Ionization energies | 1402.3, 2856, 4578.1 kJ/mol (1st, 2nd, 3rd) |
| Discovered by | Daniel Rutherford |
Use the atomic mass in the molar mass calculator for any formula containing N.
Position in the periodic table
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Molecules with nitrogen
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Frequently asked questions
What is the atomic mass of nitrogen?
The atomic mass of nitrogen is 14.007 u, so one mole of nitrogen atoms weighs 14.007 g.
What is the electron configuration of nitrogen?
Nitrogen has 7 electrons: 1s² 2s² 2p³, or [He] 2s² 2p³ in noble-gas notation. Electrons per shell: 2, 5.
How many valence electrons does nitrogen have?
Nitrogen has 5 valence electrons (group 15).
Is nitrogen a metal?
No. Nitrogen is a nonmetal (reactive nonmetal).
Where is nitrogen on the periodic table?
Nitrogen is in group 15 (pnictogens), period 2, in the p-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.