Nitrogen

Nitrogen is a chemical element; it has symbol N and atomic number 7. Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table, often called the pnictogens. It is a common element in the universe, estimated at seventh in total abundance in the Milky Way and the Solar System. At standard temperature and pressure, two atoms of the element bond to form N2, a colourless and odourless diatomic gas. N2 forms about 78% of Earth's atmosphere, making it the most abundant chemical species in air. Because of the volatility of nitrogen compounds, nitrogen is relatively rare in the s

biogeochemical cycle by which nitrogen is converted into various chemical forms

set of fusion reactions by which stars convert hydrogen to helium: 4¹H+2e⁻→⁴He+2e⁺+2e⁻+2νₑ+3γ+24.7 MeV→⁴He+2νₑ+3γ+26.7 MeV

liquid state of the element nitrogen

thumb|350px|A modern computerised nitriding furnace Nitriding is a heat treating process that diffuses nitrogen into the surface of a metal to create a case-hardened surface. These processes are most commonly used on low-alloy steels. They are also used on titanium, aluminium and molybdenum.

Niter or nitre is the mineral form of potassium nitrate, KNO3. It is a soft, white, highly soluble mineral found primarily in arid climates or cave deposits.

isotope of the element nitrogen

analytical chemistry method to determine the amount of nitrogen in certain organic compounds

euthanasia device

In chemistry, the pentazenium cation (also known as pentanitrogen) is a positively-charged polyatomic ion with the chemical formula and structure . Together with solid nitrogen polymers and the azide anion, it is one of only three poly-nitrogen species obtained in bulk quantities.

form of asphyxiation which results from breathing a physiologically inert gas with no or low oxygen content

nutrient deficiency

nitrogen in a solid state

chemical measure

method for the quantitative determination of nitrogen in chemical substances

plants hosting N-fixing Frankia symbioants in nodules

Assimilate nitrogen from inorganic nitrogen

place of production of potassium nitrate or saltpetre from organic matter

2019 construction crisis Netherlands due to stalled permit applications

in soil science, decomposition or oxidation of the chemical compounds in organic matter

air-to-nitrogen production complexes

Nitrogenous compounds found in living systems

principle in mass spectrometry

In geochemistry, hydrology, palaeoecology, palaeoclimatology, and palaeoceanography, '''δ15N (pronounced "delta fifteen n") or delta-N-15''' is a measure of the ratio of the two stable isotopes of nitrogen, 15N:14N.