PLEASE ANSWER 10 POINTS PLUS BRAINLIEST IF RIGHT How did scientists calculate the most exact value for the mole?

1. through x-ray diffraction of silicon atoms

2. through the kinetic molecular theory by calculating the number of particles in a sample of gas

3. through counting the atoms in a sample of carbon-12 under a microscope

4. through the charge of an electron and Faraday’s constant

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.

At element makes up all organic compounds?

Which statement best summarizes the importance of ernest rutherford’s gold foil experiment? it proved that all of john dalton’s postulates were true. it verified j. j. thomson’s work on the atomic structure. it showed that an electron circles a nucleus in a fixed-energy orbit. it showed that a nucleus occupies a small part of the whole atom.