Question

use the crisscross method to find the chemical formula for the ionic compound formed by aluminum (al) and sulfur (s).
a. ais
b. al₃s₂
c. al₂s₂
d. al₂s₃

Explanation:

Step1: Determine the charges of ions

Aluminum (\(Al\)) forms \(Al^{3 +}\) (loses 3 electrons). Sulfur (\(S\)) forms \(S^{2-}\) (gains 2 electrons).

Step2: Apply criss - cross method

Criss - cross the charges (absolute values) to get subscripts. So for \(Al^{3 +}\) and \(S^{2-}\), we get \(Al_2S_3\) (simplify if possible, here \(2\) and \(3\) have no common factors other than \(1\)).

Answer:

D. \(Al_2S_3\)