an ionic compound
a compound consisting of ions (charged particles)
As all compounds are electrically neutral,
the total charge on the cations equals the total charge on the anions.
The charge on the ions is not shown in its formula
sodium chloride, NaCl,
sodium ions, (Na+), and chloride ions, (Cl−)
sodium sulfate, Na2SO4,
sodium ions, (Na+) and sulfate ions, (SO42−);
ammonium sulfate, (NH4)2SO4,
ammonium ions, (NH4+), and sulfate ions, (SO42−);
sodium silicate, (Na2SiO3),
Na+ cations and polymeric (SiO32−)x anions.