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What is covalent bond ? Explain by one example. |
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Answer» Solution :Langmuir (1919) refined the Lewis postulations by abandoning the idea of the stationary cubical arrangement of the octet, and by introducing the term covalent bond. According to Lewis-Langmuir theory, atoms can combine by sharing of ELECTRONS between them. This type of bond is called covalent bond and each atom contributes equal number of electrons for sharing in order to acquire CONFIGURATION of nearest noble gas. Example : Covalent bond in dichlorine `(Cl_(2))` moecule. The Cl atom with electronic configuration [Ne]` 3s^(2)3p^(5)`, is one electron short of the argon noble gas. The FORMATION of the `Cl_(2)` MOLECULE can be understood in terms of the sharing of 9 pair of electrons between the two chlorine atoms, each chlorine atom contributing one electron to the shared pair.  The electron pair take part in octet of both d atom. So both chlorine atom get octet like Ar [Ne] `3s^(2) 3p^(6) `or [Ar] Note : .• and x. sysmbol used to REPRESENT electron of both chlorine atom. .-. used represent covalent bond between two Cl atom. |
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