In covalent compounds, atoms are held by weak force of attraction. When heat is applied, the molecules are readily pulled out and get free movement.

Ionic compounds are formed because of the strong electrostatic force between cations and anions which are arranged in a well-defined geometrical pattern. Thus ionic compounds are crystalline solids at room temperature

In ionic bond formation the bond is formed between the oppositely charged ions and these ions come closer to each other due to electrostatic force of attraction. So ionic bond is also called electrostatic bond

Substances which have the ability to oxidise other substances are called oxidising agents. These are also called as electron acceptors because they remove electrons from other substances.
Example: H₂O₂, MnO₄^-, CrO₃ , Cr₂O₇^2-

(a) Redox reaction
(b) Reduction
(c) Oxidation

(a) Aluminium (Al \(\rightarrow\) Al³⁺ +3e^-)
(b) Oxygen atom (O + 2e^- \(\rightarrow\)O^2-)

Bond which is formed between atoms by the mutual sharing of electrons is known as covalent bond.

An ionic bond is a chemical bond formed by the electrostatic attraction between positive and negative ions. The bond is formed between two atoms when one or more electrons are transferred from the valence shell of one atom to the valence shell of the other atom.

Kossel - Lewis theory is based on the concept of electronic configuration of noble gases.

A chemical bond may be defined as the force of attraction between the two atoms that binds them together as a unit called molecule