Which of the following statements is true regarding lithium (Li) in relation to its electron configuration and flame test color?

Lithium’s electron configuration ends with 1s² 2s¹, meaning it has one valence electron that can be easily lost. Because it has a single 2s electron, it behaves like the other alkali metals but with a much smaller atomic radius. When lithium is heated in a flame, that single electron is excited and then returns to its ground state, emitting light at a wavelength that appears crimson. Thus the true statement is that lithium has the configuration 1s² 2s¹ and its flame test produces a crimson color, as seen when a small piece of lithium is held in a flame and a bright red hue appears.