Question

what is the chemical formula for magnesium phosphide?
a. mg2p3
b. mg3p2
c. mg2p
d. mgp2

Explanation:

Step1: Determine ion charges

Magnesium (Mg) is in group 2, so it forms a $Mg^{2 + }$ ion. Phosphorus (P) is in group 15 and forms a $P^{3 - }$ ion.

Step2: Balance charges

To balance the charges, we need 3 magnesium ions ($3\times( + 2)=+6$) and 2 phosphorus ions ($2\times(- 3)= - 6$).

Answer:

B. $Mg_3P_2$