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Asked by P Murali Krishna

May 4, 2015

Explain partial ionic character in covalent bond?

Explain partial ionic character in covalent bond?

Answers(1)

Answer

Swathi Ambati

Member since Apr 28, 2014

When two atoms with different electro-negativities combine to form a covalent bond, the electron density between atoms is shared in such a way that it is displaced more towards the more electronegative atom.

As a result, the more electronegative atom gets a partial negative charge, while the less electronegative atom gets a partial positive charge. The partial positive and negative charges on the dipole are indicated by the + δ and - δ, respectively.

Therefore, in hetero-atomic molecules in which the two atoms differ considerably in electro-negativity, two electric poles develop. We say that the molecule has developed polarity.

The covalent molecule with the two oppositely charged poles is called a dipole.

For example, the dipole in hydrogen chloride,is represented as

H+δ – Cl -δ

Hence, the bond is called a polar covalent bond, and the molecule is called a polar covalent molecule.  

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