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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 form of chemical bonding that is characterized by the sharing of pairs of electrons between atoms, and other covalent bonds. In short, the attraction-to-r â¦ epulsion stability that forms between atoms when they share electrons is known as covalent bonding. covalent bond is a bond that forms between two nonmetals in which the atoms share electrons in order for them both to have a perfect octet of valence electrons. It is the st â¦ rongest type of intramolecular bond.