The bond formed between two atoms through the sharing of three electron pairs is called a triple bond. Three horizontal lines between two atoms denote a triple bond, e.g., nitrogen molecule is given asN≡N.
(i) Formation of N2 molecule: Nitrogen atoms have five electrons in their outermost shells. Therefore, in N2 molecules, two nitrogen atoms share 3 electrons with each other, thus acquiring the stable structure and forming a N2 molecule with triple bonds.
(ii) Formation of acetylene molecule (C2H2): In acetylene molecule, each carbon atom satisfies its valency by sharing one electron with a hydrogen atom and sharing the other three electrons with the other carbon atom as shown:
