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Chemistry 13 Online
OpenStudy (anonymous):

I am so dumb when it comes to chemistry, why do girls have to take it anyway? Here it is! Which pair of species have the most nearly identical atomic and molecular properties? 12/6C and 13/6 C or 7/3Li and 9/4Be or 19/9F and 19/9F- or 35/17 Cl and 80/35 Br or 23/11Na and 23/11Na+. Please help me, I will be in your debt.

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