3: Ionic Compounds
- Page ID
- 393862
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- 3.1: A Molecular View of Elements and Compounds
- Most elements exist with individual atoms as their basic unit. It is assumed that there is only one atom in a formula if there is no numerical subscript on the right side of an element’s symbol. There are many substances that exist as two or more atoms connected together so strongly that they behave as a single particle. These multi-atom combinations are called molecules. A molecule is the smallest part of a substance that has the physical and chemical properties of that substance.
- 3.2: Ionic Bonds
- Atoms have a tendency to have eight electrons in their valence shell. The attraction of oppositely charged ions is what makes ionic bonds.
- 3.3: Ions
- Ions can be positively charged or negatively charged. A Lewis diagram is used to show how electrons are transferred to make ions and ionic compounds.
- 3.4: Ions of Some Common Elements
- Atoms in the same group will generally form similar ions because they have the same number of valence electrons. In this section, we look at the common charges of elements and the periodic table.
- 3.5: Polyatomic Ions
- Polyatomic ions are ions that are composed of multiple atoms. These ions are very common in environmental, biological, geological, and acid-base chemistry.
- 3.6: Formulas of Ionic Compounds
- Proper chemical formulas for ionic compounds balance the total positive charge with the total negative charge. Groups of atoms with an overall charge, called polyatomic ions, also exist.
- 3.7: Naming Ionic Compounds
- Ionic compounds are named by stating the cation first, followed by the anion. Positive and negative charges must balance. Some anions have multiple forms and are named accordingly with the use of roman numerals in parentheses. Ternary compounds are composed of three or more elements.