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1. |
Modern periodic table is based on atomic number of the elements. The significance of atomic number was proved by the experiment of ________ |
A. | Moseley's work on x-ray spectra |
B. | Bragg's work on x-ray diffraction |
C. | Mulliken's oil drop experiment |
D. | Discovery of x-ray by roentgen |
Answer» B. Bragg's work on x-ray diffraction | |