Final answer:
Chlorine's atomic number is 17 with isotopes chlorine-35 and chlorine-37 in natural abundance. The average atomic weight of chlorine is around 35.45.
Explanation:
Chlorine has an atomic number of 17. It has two stable isotopes: chlorine-35 and chlorine-37. In natural abundance, chlorine-35 is around 75% and chlorine-37 is around 25%. The average atomic weight of chlorine is approximately 35.45.
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