Question

aluminum phosphide is a binary ionic compound. it is used as a pesticide to protect grains from being eaten by insects and rodents. write the chemical formula of aluminum phosphide. refer to a periodic table.

Explanation:

Step1: Determine ion charges

Aluminum (Al) in group 13 has a +3 charge ($Al^{3 +}$), phosphorus (P) in group 15 forms a - 3 charge ($P^{3-}$) when it becomes an ion.

Step2: Write the formula

For an ionic compound, the charges must balance. Since the magnitudes of the charges of $Al^{3 +}$ and $P^{3-}$ are equal, the chemical formula is $AlP$.

Answer:

$AlP$