Use condensed electron configurations and Lewis electrondot...

Use condensed electron configurations and Lewis electrondot symbols to depict the ions formed from each of the following atoms, and predict the formula of their compound:
(a) Cs and $S$
(b) $\mathrm{O}$ and $\mathrm{Ga}$
(c) $\mathrm{N}$ and $\mathrm{Mg}$
(d) Br and Li

Key Concepts

Condensed Electron Configuration

This concept refers to the shorthand method of writing electron configurations by using the configuration of a noble gas to represent the core electrons, followed by the arrangement of the remaining electrons. It simplifies the depiction of an element's electron configuration, which is particularly useful when highlighting the valence electrons that are involved in chemical reactions and ion formation.

Lewis Electron Dot Symbols

Lewis electron dot symbols are a method for representing the valence electrons of an atom as dots around the chemical symbol. These symbols provide a clear visualization of the electrons available for bonding, making it easier to understand how atoms interact in chemical reactions, especially in the formation of ions and covalent bonds.

Ion Formation

Ion formation involves the gain or loss of electrons by an atom to achieve a more stable electron configuration, often resembling that of a noble gas. Elements that lose electrons form cations, while those that gain electrons form anions. This process directly relates to the concepts of electron configuration and the tendency of atoms to achieve stability through the octet rule.

Ionic Compound Stoichiometry

This concept revolves around balancing the positive and negative charges of ions to form a neutral compound. When atoms form ions, the resulting charges must be balanced in a compound; the overall formula is determined by the ratio of cations to anions required to achieve electrical neutrality. This stoichiometry is vital for predicting the formula of the compounds formed from ions.