Option-1: 2, 7, 8: This electronic configuration indicates that there are 2 electrons in the first energy level, 7 electrons in the second energy level, and 8 electrons in the third energy level. However, chlorine has 17 electrons in total, so this configuration is incorrect.

Option-2: 2, 8, 7: This electronic configuration accurately represents the electron distribution in chlorine. Chlorine has 2 electrons in the first energy level, 8 electrons in the second energy level, and 7 electrons in the third energy level. This configuration correctly reflects the atomic structure of chlorine.

Option-3: 2, 8, 8: This configuration suggests that chlorine has 2 electrons in the first energy level, 8 electrons in both the second and third energy levels. However, chlorine actually has 7 electrons in its third energy level, so this configuration is incorrect.

Option-4: 7, 8, 2: This electronic configuration suggests that chlorine has 7 electrons in the first energy level, 8 electrons in the second energy level, and 2 electrons in the third energy level. However, the correct configuration for chlorine is 2, 8, 7, so this