3.126. Colors of Fireworks Barium compounds are a source of the green colors in many fireworks displays. a. What is the ground-state electron configuration for Ba ? b. The lowest-energy excited state of Ba has the electron configuration [Xe] 5d6s. What are the possible quantum numbers n,, and m, of a 5d electron? c. The excited state in part b is 1.791019J above the ground state. Could emission from that excited state account for the green color in fireworks? d. Another Ba excited state has the electron configuration [Xe] [s16p1. Its energy is 3.591019J above the ground state. Could transitions from that state to the ground state account for the green color in fireworks