I like this question because it’s mostly a knowledge question and not much math. Of course, I still got it wrong!
Is it D? K and Br being the elements involved?
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Yes, that’s right. My mistake was I read the question in a hurry and thought they asked for the most reactive element in group 17. So I added potassium and fluorine., instead of potassium and bromine. So the answer is D.
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