diatomic molecules, both the atoms joined by the covalent bond possess
As a result, the atom having
higher value of electronegativity attracts the shared electron pair much more
strongly than the other atom. For example, in HF the electron pair is more
attracted towards F as it is more electronegative than hydrogen. Due to this,
fluorine end of the molecule appears negative and hydrogen end positive. Such
molecule having two oppositely charged poles are called polar molecules and the
bond is said to be a polar covalent bond.
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