If it is covalent, which is typically between 2 or more nonmetals, we need to ask, is it a simple molecule, or is it an acid. Its toxicity is thought to be caused by its disproportionation in the lungs into SF6, which is inert, and SF4, which reacts with moisture to form sulfurous acid and hydrofluoric acid. Yes, H2O (water) is a covalent compound because of the low difference in the electronegativity of Hydrogen (2.2) and Oxygen (3.44) atoms due to which the hydrogen and oxygen atoms share electrons with each other forming polar covalent bonds. 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