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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.
â¢ covalent bond: a bond formed when atoms share one or more pairs of electrons. â Compounds that are networks of bonded atoms, such as silicon dioxide, are al so covalently bonded. â Covalent bonds usually form between nonmetal atoms. Covalent Bonds, continued â¢ Covalent compounds can be solids, liquids, or gases.â In a chlorine molecule, Cl 2, the atoms share two electrons.â They are joined by one covalent bond. Covalent Bonds, continued â¢ Atoms may share more than one pair of electrons.