Answer
Fluorapatite: Ca$^{2+}$, PO$_4^{3-}$, F$^-$
Hypo: Na$^+$, S$_2$O$_3^{2-}$
Weddellite: Ca$^{2+}$, C$_2$O$_4^{2-}$
Work Step by Step
Fluorapatite consists of calcium, phosphate, and fluoride ions. Calcium is an alkaline earth metal and thus has a 2+ ionic charge. Fluorine is a halogen and thus has a 1- ionic charge. Phosphate has a 3- charge.
Hypo consists of sodium and thiosulfate ions. Sodium is an alkalai metal and thus has a 1+ ionic charge. Thiosulfate has a 2- charge.
Weddellite consists of calcium and oxalate ions. Calcium is an alkaline earth metal and thus has a 2+ ionic charge. Oxalate has a 2- charge.
