Exercise 4 | Atoms and Molecules

Give the formulas for the ionic compounds made of the following ions:

K+ and N3-

Cr3+ and S2-

Ca2+ and NO3-

NH4+ and NO2-

potassium and oxygen

calcium and chlorine

aluminum and sulfur

K+ and N3-: K3N

Cr3+ and S2-: Cr2S3

Ca2+ and NO3-: Ca(NO3)2

NH4+ and NO2-: NH4NO2

potassium and oxygen: K2O

calcium and chlorine: CaCl2

aluminum and sulfur: Al2S3