本题目来源于试卷: Models of Bonding & Structure B.1 The Ionic Model，类别为 IB化学
[单选题]
Metal M is in group 2 of the periodic table. Which is the correct formula?
A. ${M_2}(N{H_4})_2$
B. MC$l_3$
C. $M_2SO_4$
D. $M_3(P{O_4})_2$
参考答案: D
本题详细解析:
The charges of the positive and negative ions must cancel out to give an overall neutral compound. Group 2 metals form ions with a 2+ charge. The formulae of the counterions above are: ${NH_4}^+$, $Cl^-$, ${S{O_4}}^{2-}$
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