Nitrogen is a gaseous element, that is, what is in nitrogen is nitrogen.
Nitrogen
nitrogen can be three different substances as a solid, liquid, and a gas.
Fertilizer may contain: potassium, nitrogen, phosphorous, sulfur, cacium and some microelements.
Two substances that contain nitrogen are ammonia (NH3) and nitric acid (HNO3). Both of these substances are commonly used in various industrial and agricultural applications.
It’s an element
N2 is nitrogen gas but technically its dinitrogen
Nitrogen fixation is the conversion of atmospheric nitrogen, N2, into some biological form, such as ammonia, NH3, or nitrogen dioxide, NO2. In nature, this process is most often completed by nitrogen-fixing bacteria or diazotrophs. Nitrogen fixation is important because only fixed nitrogen can be used for basic biological substances such as proteins and nucleic acids.
Three substances are water, nitrogen, and access salts.
Oxygen, Nitrogen, Estrogen
1 nitrogen 3 Hydrogen
Proteins are a class of such substances.
Bacteria Certain bacteria can use nitrogen from the air to make nitrogen-containing substances called nitrites. Other bacteria can turn nitrites into nitrates-another group of nitrogen-containing substances.