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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.
Covalent bonds form when sharing atoms results in the highest stability. 1  Other types of bonds besides ionic and covalent chemical bonds exist, too. 2  A chlorine atom, in contrast, is short one electron to fill its outer shell. 3  Sodium and chlorine form an ionic bond with each other, to form table salt or sodium chloride.