Question

chlorine has 7 outer energy level electrons and argon has 8. what is the difference in the reactivity of these two elements?

Answer 1

Chlorine is highly reactive as it seeks to gain an extra electron to balance its outer shell (max 8) and argon is stable because it has a stable outer shell

Answer 2

chlorine is more reactive than argon, because argon is not reactive at all. Chlorine only has to gain 1 valence electron