Question

Select all cases in which the units comprising the solid are best classified as ions?

P4
Mg(ClO3)2
Ge
Pb(NO3)2
Ag
C2H4O2

Answer 1

You don't expect the elements P4, Ge, and Ag to be anything but covalent bonds. C2H4O2 might be anything but it could be acetic acid which is largely a covalent compound. The other two are salts that have a crystal structure largely made up of the ions.