Account for the covalent character in ionic compounds

Asked by lovemaan5500 | 24th Nov, 2017, 08:48: PM

Expert Answer:

It is a common experience that many times ionic bond has some covalent character and a covalent bond has some ionic character. the formation of an intermediate between an ionic and covalent bond occurs through a phenomenon known as the polarisation of ions.
When oppositely charged ions approach each other, the attraction between the charge of cation and negative charge of anion and also the simultaneous repulsion between their electrons result in the distortion, deformation or polarisation of the electrons and cloud of the anion.
The electron charge of the anion no longer remains spherical gets distorted, i.e., polarised towards the cation shown in the figure above. the electron charge cloud of anions gets distorted,i.e., polarised by cation through the similar process but polarisation of the cation is far less pronounced because of its small size. the polarisation of ions is in a high electron concentration between the two nuclei. this results in the formation of an intermediate between an ionic and covalent bond. this type of bond is called a polar covalent bond. A polar covalent bond more stable than a purely covalent bond. the higher the degree of polarisation higher the stability of polar covalent bond. 

Answered by Ramandeep | 29th Nov, 2017, 01:02: PM