Multiple choice

Modern periodic table is based on the atomic number of elements. Which of the following experiments proved the significance of the atomic number?

  1. Millikan's drop experiment

  2. Moseley's work on X-ray spectra

  3. Bragg's work on X-ray diffraction

  4. Discovery of X-ray roentgen
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B Correct answer
Explanation

Moseley was able to show that the frequencies of certain characteristic X-rays emitted from chemical elements are proportional to the square of a number which is close to the element's atomic number; a finding which supported van den Broek and Bohr's model of the atom in which the atomic number is the same as the number of positive charges in the nucleus of the atom.

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