Chemical bond may be defined as the force of attraction by which two atoms are held together.
The chemical bonds lead to the formation of molecules and crystals.
There are various kind of bonding that we see around us.
A covalent bond is formed by mutual sharing of electrons between two atoms.
For example in case of hydrogen molecule the molecule is found by mutual sharing of one electron From each of the atom.
Similarly in case of oxygen molecule every atom shares two electrons .
This type of bond is formed by the electrostatic attraction between the positively charged and negatively charged ions.
For example the bond formed in case of NaCl is a type of ionic bond.
Na → Na + + 1e–
Here the sodium is forming a positively charged ion called the cation.
Cl + 1 e– → Cl –
Here the Chlorine is forming a negatively charged ion called the anion.
Na+ + Cl– → NaCl
This is a special kind of covalent bond in which both the shared electrons are contributed only by one atom. For example as in case of ozone.