Chlorine occurs in nature in two isotopic forms, with masses 35 u and 37 u, then average atomic mass of chlorine atom estimated would have been:
35.5 u
Naturally occurring chlorine is a mixture of about 75% of the isotope with mass 35 u and 25% of the isotope with mass 37 u.
Average atomic mass = (35 x 0.75) + (37 x 0.25) = 26.25 + 9.25 = 35.5 u.
Hence, this is the correct answer.
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