CBSE Class 10 Answered

1. Polar covalent bond results with an unequal sharing of electrons. A polar bond is a type of covalent bond between two atoms or more in which electrons are shared unequally. Because of this, one end of the molecule has a slight, relative negative charge and the other a slight, relative positive charge. For example: H₂O; here hydrogen has a slight positive charge and oxygen has a slight negative charge. They are formed when when two elements bond with a moderate difference in electronegativity moderately to greatly, but they do not surpass 1.7 in electronegativity difference.

2. Ionic bond: In an ionic bond, the atoms are bound together by the attraction between oppositely-charged ions. These kinds of bonds occur mainly between a metallic and a non metallic atom. Here one or more atoms lose electrons and other atoms gain them in order to produce a noble gas electron configuration. These bonds are formed when two atoms have a large difference in electronegativity.

3. Hydrogen Bond: Hydrogen bonds only form between hydrogen and oxygen (O), nitrogen (N) or fluorine (F). It is a force of attraction between a hydrogen atom in one molecule and a small atom of high electronegativity in another molecule.

There are two types of chemical bonds: Covalent and ionic.

Covalent bonds are further classified as polar and non-polar covalent bonds.

Other types of bonding includes metallic bonding and hydrogen bonding.