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The first table was arranged by atomic mass, but later Mosely improved it by arranging by _______________.

User Timror
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The first table, created by Mendeleev, was arranged by increasing atomic mass. However, it was later changed by Mosley, who arranged it the way it is today. He organized it by atomic number.
User Elmorabea
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Order of increasing atomic mass!

hope this helps :)

User Artnikpro
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