Nitrogen (N)
Nitrogen is the 7th element, a reactive nonmetal in the p-block. Its standard atomic weight is 14.007.
Nitrogen
14.007
What the table records
- Atomic number
- 7
- Standard atomic weight
- 14.007
- Group
- 15
- Period
- 2
- Block
- p-block
- Category
- Reactive nonmetal
- [He] 2s2 2p3
- Valence electrons
- 5
- Typical valence
- 3
- Van der Waals radius
- 1.6 Å
- Covalent radius
- 0.71 Å
Molecules containing nitrogen
The lightest named structures in this library that contain N.
Nitrogen, atomic
N · 14.01 g/mol
Azanide
H₂N- · 16.02 g/mol
Ammonia
H₃N · 17.03 g/mol
Ammonium
H₄N+ · 18.04 g/mol
Cyanide
CN- · 26.02 g/mol
Hydrogen Cyanide
CHN · 27.03 g/mol
Nitrogen
N₂ · 28.01 g/mol
Methylamide
CH₄N- · 30.05 g/mol
Nitroxyl
HNO · 31.01 g/mol
Hydrazide (H3N21-)
H₃N₂- · 31.04 g/mol
Methylamine
CH₅N · 31.06 g/mol
Hydrazine
H₄N₂ · 32.05 g/mol
How to read these numbers
The standard atomic weight is an average over the isotopes as they occur naturally, which is why it is rarely a whole number. It is the figure a molar mass calculation uses. Work in mass spectrometry wants the monoisotopic mass of a single isotope instead, which is a different number.
The two radii are not the same measurement. The covalent radius is half the distance between two bonded atoms of the element; the van der Waals radius is how close a non-bonded atom gets before repulsion takes over, and is always the larger. Space-filling models are drawn with the second, ball-and-stick models with the first — which is why the same molecule looks so different in the two.