Chemistry (NTSE/Olympiad)  

2. Elementary Idea of Bonding

Triple covalent bond

Triple covalent bond : 16. A triple covalent bond is formed when three pairs of electrons (six electrons) are shared between the two combining atoms. A triple bond is shown by marking three short lines between the two symbols of the atoms.
1. Formation of a nitrogen molecule (N2):
An atom of nitrogen has five electrons in its valence shell. It requires three more electrons to attain the stable octet. This is achieved when two nitrogen atoms combine together by sharing three electrons each to form a nitrogen molecule.

Pictorially, a nitrogen molecule can be represented as in figure.

2. Formation of an acetylene molecule (C2H2) : In an acetylene molecule, two C atoms combine with two H atoms. Each C atom shares three of its valence electrons with the other C atom. One electron of each C atom is shared with one electron of a H atom.
Thus, in a molecule of acetylene, there is a triple covalent bond between the two C atoms and each C atom is joined to one H atom by a single covalent bond. Pictorially, a molecule of acetylene may be represented as in figure.

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