HF (g) = hydrogen fluoride -> HF (aq) = hydrofluoric acid, HBr (g) = hydrogen bromide -> HBr (aq) = hydrobromic acid, HCl (g) = hydrogen chloride -> HCl (aq) = hydrochloric acid, H2S (g) = hydrogen sulfide -> H2S (aq) = hydrosulfuricacid. Compounds between Metals and Nonmetals (Cation and Anion) Compounds made of a metal and nonmetal are commonly known as Ionic Compounds, where the compound name has an ending of -ide. The chemical formula of a simple covalent compound can be determined from its name. For example, the electronegativity value of hydrogen is 2.20, and fluorine is 3.98. How do you write diphosphorus trioxide? The anions are all of the first type, and gain electrons until they have the same number as the nearest noble gas. If you are curious about the electronegativity trends, what the electronegativity chart looks like, what electropositivity is, and how do you use the electronegativity periodic table to calculate ionic or covalent bonds, then continue reading to get all the answers and more! It is among the highly reactive non-metal gases that have low melting and boiling points. A quick way to identify acids is to see if there is an H (denoting hydrogen) in front of the molecular formula of the compound. If there is not a prefix before the first element, it is assumed that there is only one atom of that element. Is each compound are formed from ionic bonds, covalent bonds, or both? Follow the given steps to find out the type of bond between elements based on the electronegativity: Select the electronegativity value of the first element. We use the absolute value because we need the END value to always be positive to identify the type of chemical bond. See video 2.7.3 below. 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