Please help with this

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.

The nuclear fission process releases neutrons and question 27 options: alpha particles electrons energy beta particles

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: