Suppose you know the number of protons in an atom. What other information would you need in order to determine the mass of the atom? Explain your reasoning. Help Plz

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

How many atoms are there in 5.70 mol of mg

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?