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Explain about Polar Covalent bond and also explain about co-ordinate bonds. Complete explanation, with examples. And why is the shape of a water molecule BENDED? How do you decide the electronegativity of an element? What are the properties of a covalent and ionic bond.

Asked by Saksham Puri 29th March 2013, 6:33 PM
Answered by Expert
A polar covalent bond is a bond between two non-metals with different electronegativities. Only bonds between the same elements are truly nonpolar. The higher the difference in electronegativity, the more polar the bond is. Take a look at this table of electronegavities and let's try some examples. 

The colourless gases ammonia and hydrogen chloride are allowed to mix, a thick white smoke of solid ammonium chloride is formed.

Ammonium ions, NH4+, are formed by the transfer of a hydrogen ion from the hydrogen chloride to the lone pair of electrons on the ammonia molecule.

The arrow points from the atom donating the lone pair to the atom accepting it.

Answered by Expert 31st March 2013, 6:14 AM
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