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The abnormality of HF is due to the presence of hydrogen bonding. They are covalent substances soluble in polar solvents. The bond strength of HX decreases down the group as the bonds become less polar. This property governs the reactivity of the halides.
A covalent bond is a bond between two nonmetals, where the electrons are essentially shared. For example water is H2O.Oxygen needs two more electrons to have a full valence (â¦ outer shell) and each hydrogen needs one electron, so they share electrons to form the stable compound water.An ionic bond is a bond between a metal and a nonmetal, where there is an exchange of electrons. covalent bond is a bond between two nonmetals, where the electrons are essentially shared. For example water is H2O.