TCA: Chemistry: Color burning elements Online version what color do elements burn by Elvira Trevino 1 Lithium (Li) 2 Sodium Na 3 Potassium K 4 Rubidium Rb 5 Caesium Cs 6 Calcium Ca 7 Strontium Sr 8 Barium Ba 9 Radium Ra 10 Copper Cu 11 Iron Fe 12 Boron B 13 Indium In 14 Lead Pb 15 Arsenic As 16 Antimony Sb 17 Selenium Se 18 Zinc Zn