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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

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

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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
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User GrizzlyBear
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1. the periodic table is arranged in order of atomic number
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User Pablo Ruan
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