Ba+O2 Ba+H2 Ba+Ce2 Ba+S Ba+N2 Ba+Br2 Ba+I2

2Ba+O2=2BaO Ba+H2=BaH2 Ba+CI2=BaCI2 Ba+S=BaS 3Ba+N2=Ba3N2 Ba+Br2=BaBr2 Ba+I2=BaI2