In which year did Langmuir reform the Lewis concept by abandoning the idea of a stable cubical arrangement of the octet and introducing the term ‘covalent bond’?

Question

Question

This question was previously asked in

SSC CGL 2022 Tier-I Official Paper (Held On : 05 Dec 2022 Shift 3)

Answer 1

The correct answer is 1919.

Key Points

Langmuir in 1919 refined the Lewis postulation by abandoning the idea of the stationary cubical arrangement of the octet, and by introducing the team covalent bond.
Covalent bonds;-
- They are formed by the sharing of electrons between two atoms so that both can achieve a filled outermost shell.
- When two atoms share one electron pair they are said to be joined by a single covalent bond.
In many compounds, we have multiple bonds between atoms. The formation of multiple bonds envisages the sharing of more than one electron pair between two atoms.
If two atoms share two pairs of electrons, the covalent bond between them is called a double bond.
When combining atoms share three electrons Paris as in the case of two nitrogen atoms in the N₂molecule and the two carbon atoms in the ethyne molecule, a triple bond is formed.

Additional Information

The first description of covalent bonding was provided by Gilbert N. Lewis in terms of the sharing of electron pairs between atoms
He related the process to the attainment of noble gas configurations by reacting atoms as a result of sharing of electrons.
Kossel and Lewis in 1916 developed a theory of chemical combination between atoms known as the electronic theory of chemical bonding.