7N14.007
Nitrogen
Nonmetal
Gas at STP
Period 2Group 15Block PDiscovered 1772
[He] 2s2 2p3
Nitrogen is a chemical element with symbol N and atomic number 7. It is the lightest pnictogen and at room temperature, it is a transparent, odorless diatomic gas. Nitrogen is a common element in the universe, estimated at about seventh in total abundance in the Milky Way and the Solar System.
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Atomic Properties
| Atomic Number | 7 |
| Atomic Mass | 14.007 u |
| Electron Configuration | [He] 2s2 2p3 |
| Oxidation States | +5, +4, +3, +2, +1, -1, -2, -3 |
| Electronegativity | 3.04 (Pauling) |
| Atomic Radius | 155 pm |
| Ionization Energy | 14.534 eV |
| Block | P |
Physical Properties
| Appearance | colorless gas, liquid or solid |
| Standard State | Gas |
| Melting Point | 63.15 K (-210.0 °C) |
| Boiling Point | 77.36 K (-195.8 °C) |
| Density | 0.0012506 g/L |
| CPK Color | #3050F8 |
Classification
| Category | Nonmetal |
| Group Block | Nonmetal |
| Period | 2 |
| Group | 15 |
| Block | P |
Discovery
| Year Discovered | 1772 |
| Discovered By | Daniel Rutherford |
| Named By | Jean-Antoine Chaptal |
| Electron Shells | 2, 5 |