[单选题]
Which of the following is the correct formula for strontium sulfide?
A. $S{r_2}{S_2}$
B. $Sr{S_2}$
C. SrS
D. $S{r_2}S$
参考答案: C
本题详细解析: Strontium is in group 2 and so forms$S{r^{2+}}$ ions. The formula of the sulfide ion is $S^{2-}$ as sulfur is in group 16. For the positive and negative charges to cancel out, one of each ion is required.
