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Chemistry 14 Online
OpenStudy (anonymous):

Elements on the periodic table are arranged by increasing reactivity. mass. atomic number. number of neutrons.

OpenStudy (ipwnbunnies):

Definitely by increasing atomic number, which is also the number of protons an atom of that element has. The atomic number is the number at the very top of each element's block.

OpenStudy (anonymous):

Thankss!

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