Nitrogen | Definition, Symbol, Uses, Properties, Atomic Number,
2024年12月6日 · Nitrogen, nonmetallic element of Group 15 [Va] of the periodic table. It is a colorless, odorless, tasteless gas that is the most plentiful element in Earth’s atmosphere and is a constituent of all living matter.
nitrogen summary | Britannica
nitrogen, Gaseous chemical element, chemical symbol N, atomic number 7. A colourless, odourless, tasteless gas, it makes up 78% of Earth’s atmosphere and is a constituent of all living matter. As the nearly unreactive diatomic molecule N 2, it is useful as an inert atmosphere or to dilute other gases.
Nitrogen - Properties, Reactions, Compounds | Britannica
2024年12月6日 · Nitrogen - Properties, Reactions, Compounds: Nitrogen is a colourless, odourless gas, which condenses at −195.8 °C to a colourless, mobile liquid. The element exists as N2 molecules, represented as :N:::N:, for which the bond energy of 226 kilocalories per mole is exceeded only by that of carbon monoxide, 256 kilocalories per mole.
nitrogen - Kids | Britannica Kids | Homework Help
Nitrogen has no color, taste, or smell. On its own it is not very active. It must be combined in compounds to be used by living things. Nitrogen compounds help plants grow and make up protein in animals. Nitrogen becomes a liquid at very low temperatures.
Nitrogen Definition & Meaning | Britannica Dictionary
NITROGEN meaning: a chemical that has no color or smell and that makes up a large part of the atmosphere
Nitrogen - Essential, Compounds, Cycle | Britannica
2024年12月6日 · Nitrogen - Essential, Compounds, Cycle: As might be expected in view of the importance of the presence of nitrogen in living matter, most—if not all—organic nitrogen compounds are physiologically active. Most living organisms cannot utilize nitrogen directly and must have access to its compounds.
Nitrogen cycle | Definition & Steps | Britannica
2024年10月21日 · Nitrogen cycle, circulation of nitrogen in various forms through nature. Nitrogen, a component of proteins and nucleic acids, is essential to life on Earth. Although 78 percent of the atmosphere is nitrogen gas, this gas is unusable by most organisms until it is made available by a series of microbial transformations.
nitrogen - Students | Britannica Kids | Homework Help
During breathing nitrogen is exhaled from the lungs chemically unchanged. Most nitrogen exists as a free element in the atmosphere. The compounds it forms are extremely active and essential to all living things. Protoplasm in living cells requires nitrogen for its formation.
Nitrogen dioxide | Definition, Chemistry, Sources, Air Pollution ...
2024年11月7日 · nitrogen dioxide, inorganic compound, a highly reactive and poisonous gas. Nitrogen dioxide is one of several nitrogen oxides (NO x), including nitrous acid and nitric acid, and is often used as an indicator for the larger group of nitrogen oxides. Pungent and extremely volatile, the gas is a dangerous air pollutant associated with fossil fuel ...
Nitrogen fixation | Definition, Process, Examples, Types, & Facts ...
2024年10月24日 · Nitrogen fixation, any natural or industrial process that causes free nitrogen, which is a relatively inert gas plentiful in air, to combine chemically with other elements to form more-reactive nitrogen compounds such as ammonia, nitrates, or nitrites.