Figure: Metals That Form More Than One Cation and Their Locations in the Periodic Table: With only a few exceptions, these metals are usually transition metals or actinides. Figure: The Relationship between the Names of Oxoanions and the Number of Oxygen Atoms Present Note the Pattern Cations are always named before anions. Most transition metals, many actinides, and the heaviest elements of groups 13–15 can form more than one cation. Summary Ionic compounds are named according to systematic procedures, although common names are widely used. Systematic nomenclature enables us to write the structure of any compound from its name and vice versa. Ionic compounds are named by writing the cation first, followed by the anion. If a metal can form cations with more than one charge, the charge is indicated by roman numerals in parentheses following the name of the metal. Oxoanions are polyatomic anions that contain a single metal or nonmetal atom and one or more oxygen atoms. Key Takeaway There is a systematic method used to name ionic compounds. 2.4 Naming Covalent Compounds Learning Objective To name covalent compounds that contain up to three elements.
Figure: Metals That Form More Than One Cation and Their Locations in the Periodic Table: With only a few exceptions, these metals are usually transition metals or actinides. Figure: The Relationship between the Names of Oxoanions and the Number of Oxygen Atoms Present Note the Pattern Cations are always named before anions. Most transition metals, many actinides, and the heaviest elements of groups 13–15 can form more than one cation. Summary Ionic compounds are named according to systematic procedures, although common names are widely used. Systematic nomenclature enables us to write the structure of any compound from its name and vice versa. Ionic compounds are named by writing the cation first, followed by the anion. If a metal can form cations with more than one charge, the charge is indicated by roman numerals in parentheses following the name of the metal. Oxoanions are polyatomic anions that contain a single metal or nonmetal atom and one or more oxygen atoms. Key Takeaway There is a systematic method used to name ionic compounds. 2.4 Naming Covalent Compounds Learning Objective To name covalent compounds that contain up to three elements.
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