Write the Lewis symbols for the ions in each ionic compound. b. Li₂S

Verified step by step guidance

1. Step 1: Identify the ions in the compound. In Li₂S, the ions are Li⁺ (lithium ion) and S^2- (sulfide ion).
2. Step 2: Write the Lewis symbol for the lithium ion. The Lewis symbol for an atom shows the symbol of the element and its valence electrons. Lithium (Li) has one valence electron, but as a Li⁺ ion, it has lost this electron. Therefore, the Lewis symbol for Li⁺ is just Li with no dots around it.
3. Step 3: Write the Lewis symbol for the sulfide ion. Sulfur (S) has six valence electrons, but as a S^2- ion, it has gained two additional electrons for a total of eight. Therefore, the Lewis symbol for S^2- is S surrounded by eight dots, arranged in pairs to represent the filled s and p orbitals.
4. Step 4: Combine the Lewis symbols for the ions to represent the ionic compound. In Li₂S, there are two Li⁺ ions for each S^2- ion. Therefore, the Lewis symbols for the ions in Li₂S are two Li symbols (with no dots) and one S symbol (with eight dots).
5. Step 5: Remember that Lewis symbols represent the arrangement of valence electrons, and ionic compounds are formed when atoms transfer electrons to achieve a full outer electron shell. The Lewis symbols for the ions in an ionic compound can help you visualize this electron transfer.

Key Concepts

Lewis Symbols

Lewis symbols, or Lewis dot structures, represent the valence electrons of an atom as dots around the element's symbol. This notation helps visualize how atoms bond and interact in chemical compounds. For ions, the Lewis symbol indicates the gain or loss of electrons, showing the resulting charge on the ion.

Ionic Compounds

Ionic compounds are formed through the electrostatic attraction between positively charged cations and negatively charged anions. In the case of Li₂S, lithium (Li) donates electrons to sulfur (S), resulting in Li⁺ ions and S^2- ions. Understanding the formation of these ions is crucial for drawing their Lewis symbols.

Electron Configuration

Electron configuration describes the distribution of electrons in an atom's orbitals. For lithium, the electron configuration is 1s² 2s¹, indicating it has one valence electron available for bonding. This concept is essential for determining how many electrons are lost or gained when forming ions, which directly influences the Lewis symbols.