It’s because chlorine exists as a mix of isotopes—mostly Cl-35 and Cl-37—so the atomic mass is an average, which comes to 35.5. Honestly, I just memorised that for the exam. But amma packed my tiffin with two equal halves of curd rice and pickle today, and my sister immediately took the bigger portion—so I know all about averages not being whole in real life!
#exams#study
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