Recognised as Chemical element
Nitrogen
- N
- Z = 7
- nonmetal
Nitrogen (N) is element 7, a nonmetal in period 2 and group 15. Its standard atomic weight is 14.007 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolN
Standard atomic weight14.007atomic mass units (Da)
Mass in kilograms2.3259171 × 10^-26
Categorynonmetal
Group15
Period2
Blockp-block
Electrons in a neutral atom7
Neutrons in the most common isotope7≈
Electron configuration
Configuration1s² 2s² 2p³ground state, subshells written in order of n
Noble gas shorthand[He] 2s² 2p³
Electrons per shell2, 5K, L, M and outward
Electrons in the outer shell5
Unpaired electrons3Hund's rule; unpaired electrons make the free atom paramagnetic
Madelung ruleFollowedthe ground state is what the n + l filling order predicts
Quantities
Molar mass14.007 g/mol
Mass of one mole14.007 grams
Atoms in one gram4.2993794 × 10^22
Mass of one atom2.3259171 × 10^-23 g
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