2.Chemical properties: React with oxygen,sulfur,nitrogen and halogen to form their corresponding compounds. The elementary substances form the corresponding oxides when they burn in air: Li2O Na202 KO2 RbO2 CsO2 BeO MgO CaO SrO BaO2 Na,O, Pale yellow Pale yellow Magnesium burning in air The elementary substances form the corresponding oxides when they burn in air： Li2O Na2O2 KO2 RbO2 CsO2 BeO MgO CaO SrO BaO2 • React with oxygen, sulfur, nitrogen and halogen to form their corresponding compounds. 2.Chemical properties: Magnesium burning in air Li2O Na2O2 KO2 Pale yellow Pale yellow