I think it's reactivity. but i'm not sure.
Answer:
Option (2)
Explanation:
Since the amount of each sample is the same, we are looking for the metal with the greatest density, which is copper.
If you change the subscripts it would change the reactants or products and then you would be solving a different formula, you would change what the chemical is
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C. NO2 is covalent. Hope this helps!
