Under normal conditions, nitrogen is a simple gaseous diatomic molecule and exists as a colourless, odourless and tasteless gas. It is however one of the most electronegative elements, but is relatively unreactive. This is because its diatomic molecules are non-polar and the triple bond between them is very strong.
Nitrogen tends to form covalent compounds.
Nitrogen can also occur in plants and animals in the form of proteins . Animals obtain protein by eating plants and other animals, whereas plants produce protein from nitrates in the soil via their roots. The nitrates are formed from the atmosphere and ammonium compounds in the soil. The process for converting nitrogen into compounds usable by plants and animals is called Nitrogen Fixation . Nitrates are also introduced into the soil in the form of fertilisers, eg.