Answer
Please see the work below.
Work Step by Step
We can write the formulas for the given compounds as
a. $RbNO_2$
b. $K_2S$
c. $NaHS$
d. $Mg_3(PO_4)_2$
e. $CaHPO_4$
f. $KH_2PO_4$
g. $IF_7$
h. $(NH_2)SO_4$
i. $AgClO_4$
j. $BCl_3$
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