The order of elements in the periodic table is based on a. the number of protons in the nucleus. c. the number of neutrons in the nucleus. b. the electric charge of the nucleus. d. atomic mass.

Respuesta :

its based on the atomic number which equals the number of protons in the atomic nucleus of each element so i would say your answer is D. Atomic mass. 
A. the number of protons in the nucleus!!!!!
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