The chemical formula for aluminum and phosphorus is AlP.

Here's why:

* Aluminum (Al) is a metal with a +3 charge.

* Phosphorus (P) is a non-metal with a -3 charge.

To form a neutral compound, the charges must balance. Therefore, one aluminum atom (Al) with a +3 charge combines with one phosphorus atom (P) with a -3 charge, resulting in the formula AlP.