Final answer:
The electron configuration for the valence electrons in chlorine is 3s²3p⁵. Chlorine has seven valence electrons and tends to gain one more electron to achieve a stable noble gas configuration.
Step-by-step explanation:
The electron configuration for the valence electrons in chlorine is 3s²3p5. The valence electrons are the electrons in the highest-energy level, in this case, the third energy level. Chlorine has seven valence electrons, one less than the noble gas argon, and it tends to gain one more electron to achieve a stable noble gas configuration.