Atoms or groups of atoms that possess a net electrical charge are called ions; they can have either a positive charge (cations) or a negative charge (anions). But in general, they are known by their common name; and some are usable in our daily routine. Formulas of Ternary Acids . Chemical Compounds List - We are providing table chart for Common Names of Certain Chemical Compounds including with Chemical Name & formulas. Polyatomic ions are groups of atoms that bear net electrical charges, although the atoms in a polyatomic ion are held together by the same covalent bonds that hold atoms together in molecules. The formulae for most elements is just their symbol. Because we write subscripts only if the number is greater than 1, the empirical formula is GaAs. The name of the most common form of the acid consists of the nonmetal root name with the -ic ending. B Because Eu3+ has a charge of +3 and O2− has a charge of −2, a 1:1 compound would have a net charge of +1. To understand the differences between covalent and ionic bonding. B Two Cl− ions are needed to balance the charge on one Ca2+ ion, which leads to the empirical formula CaCl2. A substance formed by the chemical union of two or more elements. Common Names Of Certain Chemical Compounds. An ionic compound that contains only two elements, one present as a cation and one as an anion, is called a binary ionic compound. For example, salt, which is the common name for NaCl, is Sodium chloride. Because the empirical formula is based on experimental measurements of the numbers of atoms in a sample of the compound, it shows only the ratios of the numbers of the elements present. For example, at room temperature, methane, the major constituent of natural gas, is a gas that is composed of discrete CH4 molecules. The convention for representing the formulas of organic compounds is to write carbon first, followed by hydrogen and then any other elements in alphabetical order (e.g., is methyl alcohol, a fuel). Examples are ammonia (, ). The space-filling model (part (e) in Figure \(\PageIndex{4}\)) illustrates the approximate relative sizes of the atoms in the molecule, but it does not show the bonds between the atoms. Solid sodium chloride contains equal numbers of cations (Na+) and anions (Cl−), thus maintaining electrical neutrality. Then identify the substance as either an organic compound or an inorganic compound. c. A Because the charges on the ions are not given, we must first determine the charges expected for the most common ions derived from calcium and chlorine. As shown in Equation 3.1.1, the electrostatic energy of the interaction between two charged particles is proportional to the product of the charges on the particles and inversely proportional to the distance between them: \[ \text {electrostatic energy} \propto {Q_1Q_2 \over r} \label{3.1.1}\]. We will surely find many compounds in our day to day life like (H2O), which is water, our daily need, so in this compound, two molecules of Hydrogen gets combined with one molecule of Oxygen to have one molecule of water. b. Multiple groups attached to the same atom are shown in parentheses, followed by a subscript that indicates the number of such groups. In contrast, electrostatic repulsion between two species with the same charge (either both positive or both negative) results in a force that causes them to repel each other, as do the same poles of two magnets. Compounds that consist primarily of elements other than carbon and hydrogen are called inorganic compounds; they include both covalent and ionic compounds. Consider, for example, the compound formed by Mg2+ and O2−. Electrostatic attraction between oppositely charged species (positive and negative) results in a force that causes them to move toward each other, like the attraction between opposite poles of two magnets. If the electrostatic energy is positive, the particles repel each other; if the electrostatic energy is negative, the particles are attracted to each other. A chemical formula. 11 Molecular & Ionic Compounds. The substances described in the preceding discussion are composed of molecules that are electrically neutral; that is, the number of positively-charged protons in the nucleus is equal to the number of negatively-charged electrons.