Number of valence electrons in Cl- Ion are?

Explanation

Option A: This option suggests that the chloride ion (Cl-) has 18 valence electrons. However, this is incorrect. The correct number of valence electrons for the chloride ion is 8.Option B: This option suggests that the chloride ion (Cl-) has 10 valence electrons. Again, this is incorrect. The correct number of valence electrons for the chloride ion is 8.Option C: This option suggests that the chloride ion (Cl-) has 17 valence electrons. However, this is incorrect. The chloride ion gains an electron to achieve a stable electron configuration, and as a result, it has a different number of valence electrons than the neutral chlorine atom. Option D: This option correctly states that the chloride ion (Cl-) has 8 valence electrons. When chlorine gains one electron to form the chloride ion, it achieves a stable electron configuration with a full outermost energy level, similar to the noble gas argon. The chloride ion has the same electron configuration as argon (2-8-8), which means it has 8 valence electrons.