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The elements of the Periodic Table are arranged on order of increasing(1) atomic number (2) mass number (3) number of isotopes (4) number of moles
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The elements of the Periodic Table are arranged on order of increasing(1) atomic number

(2) mass number
(3) number of isotopes
(4) number of moles

User Sadegh
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2 Answers

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They're arranged by increasing atomic (proton) number. They used to me sorted by mass number, but that resulted in some anomalies in the table
User GrizzlyBear
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1. the periodic table is arranged in order of atomic number
User Pablo Ruan
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