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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 two nonmetals share an electron. Hi Covalent bonds occur when nonmetal elements have a unstable outermost shell know as the valence electrons. The two non-metal either give up of gain electrons and then live with the other element or elements outer shell. polar covalent bond is formed when 2 atoms are sharing the same electron unequally. It occurs because one of the atoms has a stronger affinity for electrons that the other. â¦. 24 people found this useful. 1  The Periodic Table of Elements Life is sustained by a number of chemical elements.