n_2
The term "n_2" typically refers to molecular nitrogen, which is a diatomic molecule composed of two nitrogen atoms. It is a colorless, odorless gas that makes up about 78% of the Earth's atmosphere. Molecular nitrogen is essential for life, as it is a key component of amino acids and nucleic acids, which are vital for all living organisms.
In the context of chemistry, n_2 is often involved in various reactions, including the Haber process, which synthesizes ammonia. It is relatively inert under standard conditions, meaning it does not easily react with other substances. This stability makes n_2 useful in various industrial applications, such as providing an inert atmosphere for chemical reactions.