Modern periodic table is based on the atomic number of the elements. The experiment which proved the significance of the atomic number was

Options :
  1. Millikan''s oil drop experiment
  2. Moseley''s work on X-ray spectra
  3. Bragg''s work on X-ray diffraction
  4. none of the above
Answer and Explanation :-

Answer: Option 2

Explanation:

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We pass through this world but once. Few tragedies can be more extensive than the stunting of life, few injustices deeper than the denial of an opportunity to strive or even to hope, by a limit imposed from without, but falsely identified as lying within.
-Stephen Jay Gould The Mismeasure of Man