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Question:
Which of the following statements is true?A. Only one electron can be excited at a time. B. An electron may fall back to ground state in a single step or in multiple steps.  C. Excited electrons do not return to ground state until they move away from the heat of the flame.   D. Each element emits a single, characteristic wavelength of light during the flame test. What is the ground state of an element? A. It is the arrangement of electrons that occurs after one or more electrons becomes excited. B. It is the most energetically favorable arrangement of the element’s electrons. C. It is the arrangement of electrons that occurs at room temperature or below. D. It is the most energetically favorable arrangement of the element’s protons. Why do certain elements produce color when heated in a flame? A. Electrons are in a constant state of excitation that causes them to emit light.  B. Electrons absorb energy from the flame and become excited, which causes them to emit light. C. Electrons absorb energy from the flame and turn into photons of light. D. Electrons absorb energy from the flame and become excited. Upon returning to the ground state, they emit light.