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RhondaSommer (rhondasommer):
The elements of the periodic table are put in order of: electrons atomic mass atomic number neutrons @Sweetburger @MissSmartiez is Atomic Mass right?
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OpenStudy (sweetburger):
No, elements were put in order of atomic mass in the first periodic table. Now they are put in order of atomic number which is defined by the number of protons in an atom.
RhondaSommer (rhondasommer):
:( fricking scientist. always changing things.... \_(o.0)_/
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