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The formula is Mg₃P₂.
This is a reaction between a metal and a nonmetal. The product will be the ionic compound, magnesium nitride.
Step 1. Identify the atomic symbols of the cation and anion.
Magnesium is Mg and phosphide is P
Step 2. Identify the charge on each ion and place it on each symbol.
Mg is in Group 2, so we write Mg²⁺.
P is in Group 15, so it needs 3 electrons to complete its octet. We write the ion as P³⁻.
Step 3. Determine the least common multiple of the charges.
The lowest common multiple of 2 and 3 is 6. We need 6 + charges and 6 – charges. Thus, we need 3 Mg²⁺ ions and 2 P³⁻ ions.
Step 4. Write the formula using the numbers as subscripts.
The formula is Mg₃P₂.
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