Why is nitrogen gas an extremely stable molecule?

Nitrogen gas is considered an extremely stable molecule primarily because it consists of two nitrogen atoms connected by a triple covalent bond. This triple bond involves sharing three pairs of electrons between the two nitrogen atoms, resulting in a very strong and stable connection. The strength of these bonds makes it difficult for the nitrogen gas to react with other substances, leading to its inertness under standard conditions.

Moreover, the formation of a triple bond means that the nitrogen atoms have a complete outer shell of electrons, which fulfills the octet rule and contributes to the stability of the molecule. This stability is intrinsic to nitrogen gas, making it less reactive compared to other diatomic molecules that might form single or double bonds, which are generally weaker and more susceptible to various chemical reactions.