Question

what is the correct formula for aluminum phosphide? alp al₅p₃ al₃p₃ pal

Explanation:

Step1: Determine the ions

Aluminum (\(Al\)) forms \(Al^{3+}\) ion and phosphorus (\(P\)) forms \(P^{3 -}\) ion.

Step2: Apply criss - cross rule

Using the criss - cross rule (the magnitude of the charge of one ion becomes the subscript of the other ion). Since the charge of \(Al^{3+}\) is \(3+\) and the charge of \(P^{3 -}\) is \(3-\), the formula is \(AlP\) (the subscripts \(3\) and \(3\) cancel out).

Answer:

A. \(AlP\)