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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.
1 A covalent bond involves a pair of electrons being shared between atoms. 2  Atoms form covalent bonds in order to reach a more stable state.  A given nonmetal atom can form a single, double, or triple bond with another nonmetal. Which type of bond is formed between the atoms depends on their numbers of valence electrons.