7NNitrogen14.007 u
Nitrogen (N)
Nitrogen is a nonmetal with atomic number 7, in period 2 and group 15 of the periodic table. Its atomic mass is 14.007 u and its electron configuration is [He] 2s² 2p³. Gas at 25 °C.
Key facts
| Atomic number | 7 |
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| Atomic mass | 14.007 u |
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| Category | Nonmetal |
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| Period | 2 |
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| Group | 15 |
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| Block | p |
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| Electron configuration | [He] 2s² 2p³ |
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| Electrons per shell | 2, 5 |
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| Electronegativity (Pauling) | 3.04 |
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| Oxidation states | −3, −2, −1, +1, +2, +3, +4, +5common in bold |
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| State at 25 °C | Gas |
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| Melting point | 63.05 K−210.1 °C |
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| Boiling point | 77.36 K−195.79 °C |
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| Density | 1.251 g/L |
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Atomic properties
| First ionization energy | 14.534 eV |
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| Electron affinity | 7 kJ/mol |
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| Atomic radius | 56 pm |
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| Covalent radius | 71 pm |
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| Van der Waals radius | 155 pm |
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| Common ions | N³⁻ |
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| Protons, neutrons, electrons | 7, 7, 7 |
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Physical and thermal properties
| Molar volume | 13.54 cm³/mol |
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| Heat of fusion | 0.36 kJ/mol |
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| Heat of vaporization | 2.79 kJ/mol |
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| Specific heat | 1040 J/(kg·K) |
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| Thermal conductivity | 0.02583 W/(m·K) |
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| Thermal expansion | --- |
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| Mohs hardness | --- |
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| Young’s modulus | --- |
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| Crystal structure | Simple hexagonal |
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| Magnetic type | Diamagnetic |
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Identification and history
| CAS number | 7727-37-9 |
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| Latin name | Nitrogenium |
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| Discovered by | Daniel Rutherford · 1772 |
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| Named by | Jean-Antoine Chaptal · 1790 |
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Natural isotopes
| Isotope | Mass (u) | Abundance |
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| 14N | 14.003074 | 99.6205 % |
| 15N | 15.000109 | 0.3795 % |
Data checked against PubChem (NIH), IUPAC, the NIST Atomic Spectra Database and the IAEA (NUBASE and AME), the same data you see in the app.
A dash (---) means there is no reliable published measurement. The app never makes one up.
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Periodic Table