Explanation:
When a less electronegative atom comes in contact with more electronegative atom then more electronegative atom tends to attract the electrons from less electronegative atom.
Hence, a partial positive charge is developed on less electronegative atom and it has given an electron. On the other hand, a partial negative charge tends to develop on more electronegative atom due to gain of an electron.
Therefore, due to the presence of these opposite charges a strong force of attraction is exerted on both the atoms. As opposite charges attract each each other and like charges repel each other.
There is a strong attraction between particles as a result of the transfer of an
electron from the less electronegative atom to the more electronegative
atom because like poles repel and unlike poles attract.
This is applicable in chemical reactions in which less electronegative
(elelctropositive) atoms donate electrons to the more electronegative
elements so as to enable them form compounds and attain a stable
configuration.
The less electronegative elements are usually metals while the more
electronegative elements are non metals.
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