ABSTRACT
There are many types of interactions that hold atoms together,
and they may be broadly classified into primary or secondary
bonding on the basis of their strengths (Table 4.2). Covalent bond-
ing involves the sharing of electrons between two atoms. Air
consists mainly of N2 molecules that are formed by two nitrogen
atoms covalently bonded together. Molecules are essential entities
making up most of our surroundings — e.g. air and water. The
forces of attraction that hold a molecule together are referred to as
intramolecular interactions.
