A chemical bond is defined as an appealing force that holds the materials (atoms, ions etc.) collectively in a chemical species. Numerous theories had been cautioned for the formation of chemical bonds together with the digital theory, valence shell electron pair repulsion idea, valence bond idea, and molecular orbital theory.

A chemical bond formation is attributed to the tendency of a gadget to reap balance. It turned into determined that the inertness of noble gases turned into because of their absolutely stuffed outermost orbitals. Therefore, it became postulated that the elements having incomplete outermost shells are unstable (reactive). Atoms, therefore, integrate with every other and entire their respective octets or duplets to achieve the solid configuration of the nearest noble gases. This aggregate can occur either with the aid of sharing of electrons or via transferring one or more electrons from one atom to every other.

The chemical bond shaped due to sharing of electrons between atoms is referred to as a covalent bond. An ionic bond is formed because of the transference of electrons from one atom to another. The octet rule or the electronic idea of chemical bonding was evolved through Kossel and Lewis. In step with this rule, atoms can combine both by using transfer of valence electrons from one atom to some other or via sharing their valence electrons with a view to reap the nearest noble gasoline configuration by using having an octet in their valence shell.

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