There are two magnesium ions for every two sulfide ions in magnesium sulfide. The ratio of Mg to S in the formula unit is .
Answer
A
1:1
B
2:2
C
1:2
Explanation
The given ratio is 2 magnesium ions to 2 sulfide ions. Divide both numbers by 2 to simplify: 2:2 = 1:1. Therefore, the ratio of Mg to S is 1:1, choice A.
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