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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.
Answer: A molecule or compound is made when two or more atoms form a chemical bond, linking them together. The two types of bonds are ionic bonds and covalent bonds. In an ionic bond, the atoms are bound together by the attraction between oppositely-charged ions.For example, sodium and chloride form an ionic bond, to make NaCl, or table salt. In a covalent bond, the atoms are bound by shared electrons.If the electron is shared equally between the atoms forming a covalent bond, then the bond is said to be nonpolar.Usually, an electron is more attracted to one atom than to another, forming a polar covalent bond. For example, the atoms in water, H 2 O, are held together by polar covalent bonds.n an ionic bond, the atoms are bound together by the attraction between oppositely-charged ions. For example, sodium and chloride form an ionic bond, to make NaCl, or table salt. In a covalent bond, the atoms are bound by shared electrons.