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which statement explains the periodic table and how is arranged. A. the periodic table is arranged by decreasing atomic mass. B. the periodic table is arranged by radioactivity levels in unstable nuclei of elements. C. The periodic table is arranged by number of neutrons ground within the most common isotopes. D. the periodic table is arranged by the outermost electrons of the elements



Answer :

the answer is  D. the periodic table is arranged by the outermost electrons of the elements

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