Deutsch: Stickstoff / Español: Nitrógeno / Português: Azoto / Français: Azote / Italiano: Azoto
Nitrogen, symbol N, is the chemical element of atomic number 7. At room temperature, it is a gas of diatomic molecules and is colorless and odorless. Nitrogen is a common element in the universe, estimated at about seventh in total abundance in our galaxy and the Solar System. On Earth, the element is primarily found as the free element; it forms about 80% of the Earth's atmosphere.

In an environmental context, "nitrogen" refers to a chemical element with the symbol N and atomic number 7, which is an essential component of life on Earth. Nitrogen is a key element in many of the building blocks of life, including amino acids, nucleic acids, and chlorophyll. It is also a critical component of the atmosphere, where it makes up approximately 78% of the total volume.

Here are a few examples of the role of nitrogen in the environment:

1. Nitrogen Cycle: This is the process by which nitrogen is transformed between various forms, including nitrogen gas, nitrates, and nitrites, in the atmosphere, soil, and water.

2. Nitrogen Fixation: This refers to the process by which nitrogen gas from the atmosphere is converted into forms that plants can use for growth, such as nitrates and nitrites.

3. Agricultural Nitrogen: This refers to the use of nitrogen-based fertilizers in agriculture to promote plant growth and increase crop yields.

4. Nitrogen Pollution: This refers to the excessive release of nitrogen compounds into the environment, often as a result of human activities, such as agricultural and industrial practices, which can lead to environmental problems such as eutrophication, algal blooms, and decreased water quality.

5. Nitrogen Deposition: This refers to the deposition of nitrogen compounds, such as nitrates and nitrites, onto the land or into water bodies, which can impact the chemical and biological processes in these ecosystems.

In an environmental context, the study of nitrogen is important because it can help to understand the effects of human activities on the environment, and to develop strategies to reduce nitrogen pollution and promote sustainable use of this essential element.