An ionic bond is a bond between a metal and a non-metal. SO2gives a weak acid solution when dissolved in water. Compounds can be classified as ionic or covalent: Ionic compounds consist of cations and anions whose total charges cancel each other out. Generally, electron affinity is studied alongside electronegativity because whenever two atoms form a bond with each other, some amount of energy is released. Some of the more common chemicals use the -ous/-ic nomenclature, but the use of Roman Numerals to designate the charge is acceptable. For example, both hydrogen and oxygen are nonmetals, and when they combine to make water, they do so by forming covalent bonds. Although HF can be named hydrogen fluoride, it is given a different name for emphasis that it is an acid. So Hg2Cl2 it the lowest whole number ratio of cation to anion. 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. Sharing of electrons between oxygen and hydrogen atoms, by the formation of a covalent bond, results in . Al is a Type I monatomic ion, no Roman Numeral is needed since the charge does not change. When the distance is increased and the shielding is also increased, it causes a decrease in nuclear attraction. Strontium is a type I cation and there is no need for a Roman Numeral. 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