Question -
Answer -
When two atoms combine bysharing their one or more valence electrons, a covalent bond is formed betweenthem.
The shared pairs of electrons presentbetween the bonded atoms are called bond pairs. All valenceelectrons may not participate in bonding. The electron pairs that do notparticipate in bonding are called lone pairs of electrons.
For example, in C2H6 (ethane), there areseven bond pairs but no lone pair present.
In H2O, there are two bondpairs and two lone pairs on the central atom (oxygen).
