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Nitrogen is a natural gaseous element with an atomic number of 7 and an atomic weight of 14.0067. In the periodic table, it belongs to the pnictogens. It is a reactive nonmetal with an electron configuration of He 2s 2 2p 3. The melting point of oxygen is -210.00 °C.
The nitrogen cycle refers to the cycle of nitrogen atoms through the living and non-living systems of Earth. The nitrogen cycle is vital for life on Earth. Through the cycle, atmospheric nitrogen is converted to a form which plants can incorporate into new proteins.
Nitrogen is one of the primary nutrients critical for the survival of all living organisms. It is a necessary component of many biomolecules, including proteins, DNA, and chlorophyll.
The key role of microbes in nitrogen fixation. How overuse of nitrogen-containing fertilizers can cause algal blooms.
Nitrogen enters the living world through nitrogen fixation (Figure \(\PageIndex{1-2}\), the process of converting nitrogen gas into ammonia (NH 3), which spontaneously becomes ammonium (NH 4 +). Ammonium is found in bodies of water and in the soil (figure \(\PageIndex{1-2}\)).
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 by volume of the atmosphere is nitrogen gas, this abundant reservoir exists in a form unusable by most organisms.
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 is a colorless, odorless gas that makes up about 78% of the Earth's atmosphere and is essential for life, being a key component of amino acids and nucleic acids.
The nitrogen cycle is the biogeochemical process through which nitrogen is converted between its various chemical forms, including atmospheric nitrogen (N2), organic nitrogen, ammonia (NH3), and nitrates (NO3-).
Nitrogen Cycle Definition. The nitrogen cycle is a biogeochemical process that transforms atmospheric nitrogen into usable forms for living organisms and then returns it to the atmosphere through a series of biological and chemical reactions.