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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.
So those atoms share electrons to form a covalent bond. A covalent bond, as I said before, is made of two or more shared electrons. But in an ionic bond, Atoms that are covalenty bonded together form a particle that contains the same number of positive and negative charges.The neutral particle formed when atoms form a covalent bond called a molecule.An ionic bond is basically the attraction of a postively charged ion to a negatively charged ion. Because of their opposite attraction, ionic bonds/ ionic compounds are very strong.n this example, the ionic compound sodium chloride (table salt) is formed. This creates the ionic compound called Sodium Chloride. For some atoms, it takes too much energy to completely gain or lose one or more electrons. In these cases, atoms share electrons to form a covalent bond.