Chapter 18 - Reaction Rates and Equilibrium - 18 Assessment - Page 642: 116

F- is called the fluoride ion. It is an anion because it has negative charge P-3 is called the phosphide ion. It is an anion because it has negative charge Sodium is located in Group 1A, so its ions only occur as 1+ charges. So a Roman numeral is not needed. Thus, it is called the sodium ion. It is a cation because its charge is positive. P- is called the iodide ion. It is an anion because it has negative charge O-2 is called the oxide ion. It is an anion because it has negative charge Sodium is located in Group 2A, and therefore its ions only occur as 2+ charges. So a Roman numeral is not needed. Thus, it is called the magnesium ion. It is a cation because its charge is positive.

F- is called the fluoride ion. It is an anion because it has negative charge P-3 is called the phosphide ion. It is an anion because it has negative charge Sodium is located in Group 1A, and therefore its ions only occur as 1+ charges. So a Roman numeral is not needed. Thus, it is called the sodium ion. It is a cation because its charge is positive. P- is called the iodide ion. It is an anion because it has negative charge O-2 is called the oxide ion. It is an anion because it has negative charge Sodium is located in Group 2A, and therefore its ions only occur as 2+ charges. So a Roman numeral is not needed. Thus, it is called the magnesium ion. It is a cation because its charge is positive.