A polar covalent bond will exist in HBr if the electronegativity of hydrogen is 2. 20 and the electronegativity of bromine is 2.96
In HBr, a covalent bond is present which is formed as a result of a small electronegativity difference between the two atoms.
It is also formed when two atoms share electrons mutually to form a bond.
For example, in the HBr case, both Bromine and hydrogen share their pair of electrons and form a covalent bond.
In general, a covalent bond forms between atoms when the forces of attraction and repulsion are balanced and in a stable condition.
In covalent bonding, shared pair of electrons is called bonding pair.
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