本题目来源于试卷: Classification of Matter A.1 Periodic Table Elements Classification，类别为 IB化学
[单选题]
Metal M is in group 2 of the periodic tablx9,c5mivv ts)ea/i kfjyu1r+ 2;dnwz 9. Which is the correct formula?
A. $M_2(NH_4)_2$
B. $MCL_3$
C. $M_2SO_4$
D. $M_2(PO_4)_2$
参考答案: D
本题详细解析:
Explanation: 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: $NH4^+$,$Cl^−$,$SO_4^{2−}$,and $PO_4^{3−}$.
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