Which two ions are not in balance in this equation: Na_2SO_4 + SrCl_2 -> NaCl + SrSO_4?

${\text{Na"^+ "& Cl}}^{-}$
${\text{Na"_2"SO"_4 + "SrCl"_2 -> "NaCl + SrSO}}_{4}$
${\text{Na"_2"SO"_4 + "SrCl"_2 -> color(green)(2)"NaCl + SrSO}}_{4}$