Write a formula for the ionic compound that forms between...

Write a formula for the ionic compound that forms between each pair
of elements.
$\begin{array}{ll}{\text { a. silver and chlorine }} & {\text { b. sodium and sulfur }} \\ {\text { c. aluminum and sulfur }} & {\text { d. potassium and chlorine }}\end{array}$

Key Concepts

Ionic Bonding

Ionic bonding is a type of chemical bond that forms when one atom, typically a metal, loses electrons to become a positively charged ion (cation) while another atom, typically a non-metal, gains electrons to become a negatively charged ion (anion). The electrostatic attraction between these oppositely charged ions holds them together in an ionic compound.

Determining Ion Charges

Understanding the typical charges of elements is crucial in predicting the formula of ionic compounds. Metals usually form cations by losing electrons, with their charges often corresponding to their group number, whereas non-metals form anions by gaining electrons, with their charges typically being one of a few common values based on their electron configurations.

Charge Neutrality

Ionic compounds must be electrically neutral, meaning the total positive charge from the cations must equal the total negative charge from the anions. When writing chemical formulas for ionic compounds, one must balance these charges by adjusting the subscripts of the ions in the formula, resulting in a ratio that leads to overall neutrality.

Criss-Cross Method

The criss-cross method is a helpful technique in writing formulas for ionic compounds. It involves taking the absolute value of the charge on the cation and making it the subscript for the anion, and vice versa. This method ensures that the ratio of ions results in a neutral compound by effectively balancing the charges.

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