Who established the atomic number of an atom as more important ...

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Who established the atomic number of an atom as more important than the atomic weight, thus reorganizing the periodic table?
 
 

Moseley.
  Mendeleev.
  Rutherford.
  Einstein.

  Brown.
 

Question 2

By the early part of the 20^th century, theoretical physics had changed dramatically because of so many new results. The work of Franck and Hertz showed that the atomic levels were quantized. Why did that work specifically make so much of an impact at that time?
 

A. More and more scientists rejected their findings and reaffirmed the triumphs of classical physics.
  B. Their work moved science to the discovery of hydrogen as an element.
  C. It affirmed that quantum physics triumphed over classical physics in key cases.
  D. They showed that when using large length scales, quantum effects dominate.
  E. All of the above.

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Answer to Question 1

Moseley's work on characteristic x-ray spectra determined that the number of protons, not the whole atomic weight A of the nucleus, was the most important factor in chemical bonding and in ordering the periodic table

Answer to Question 2

C.
Their work was so important at the time because it affirmed Planck's work to be true, that nature does exhibit quantization. The key cases involved could only be explained by quantum physics, and showed its triumph over classical physics.

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[emsimon14]

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