Question

question 25
4 pts
the correct formula for a compound formed from the elements al and s is,
al₂s₃
al₂s
alo₃
al₃s₂
als

Explanation:

Step1: Determine the charges of ions

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

Step2: Use the criss - cross method

To form a neutral compound, we use the criss - cross method. The magnitude of the charge of one ion becomes the subscript of the other ion. So for \(Al^{3+}\) and \(S^{2 - }\), the formula is \(Al_{2}S_{3}\) (since \(|3| = 3\) (subscript for \(S\)) and \(|2|=2\) (subscript for \(Al\))).

Answer:

\(Al_{2}S_{3}\) (the first option)